http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/binaryclass/news20_pa.html
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+++ b/userguide/binaryclass/news20_pa.html
@@ -634,6 +634,21 @@
             
         </li>
     
+        <li class="chapter " data-level="3.5" 
data-path="../ft_engineering/feature_selection.html">
+            
+                <a href="../ft_engineering/feature_selection.html">
+            
+                    
+                        <b>3.5.</b>
+                    
+                    Feature selection
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+                </a>
+            
+
+            
+        </li>
+    
 
     
         
@@ -1567,16 +1582,59 @@
 
     
         
+        <li class="header">Part X - Hivemall on Spark</li>
+        
+        
+    
+        <li class="chapter " data-level="10.1" 
data-path="../spark/misc/misc.html">
+            
+                <a href="../spark/misc/misc.html">
+            
+                    
+                        <b>10.1.</b>
+                    
+                    Generic features
+            
+                </a>
+            
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+            
+            <ul class="articles">
+                
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data-path="../spark/misc/topk_join.html">
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+                <a href="../spark/misc/topk_join.html">
+            
+                    
+                        <b>10.1.1.</b>
+                    
+                    Top-k Join processing
+            
+                </a>
+            
+
+            
+        </li>
+    
+
+            </ul>
+            
+        </li>
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+
+    
+        
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-        <li class="chapter " data-level="10.1" >
+        <li class="chapter " data-level="11.1" >
             
                 <a target="_blank" 
href="https://github.com/maropu/hivemall-spark";>
             
                     
-                        <b>10.1.</b>
+                        <b>11.1.</b>
                     
                     Hivemall on Apache Spark
             
@@ -1586,12 +1644,12 @@
             
         </li>
     
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                 <a target="_blank" 
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-                        <b>10.2.</b>
+                        <b>11.2.</b>
                     
                     Hivemall on Apache Pig
             
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+                        <b>3.5.</b>
+                    
+                    Feature selection
+            
+                </a>
+            
+
+            
+        </li>
+    
 
     
         
@@ -1567,16 +1582,59 @@
 
     
         
+        <li class="header">Part X - Hivemall on Spark</li>
+        
+        
+    
+        <li class="chapter " data-level="10.1" 
data-path="../spark/misc/misc.html">
+            
+                <a href="../spark/misc/misc.html">
+            
+                    
+                        <b>10.1.</b>
+                    
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+            
+                </a>
+            
+
+            
+            <ul class="articles">
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+    
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                 <a target="_blank" 
href="https://github.com/maropu/hivemall-spark";>
             
                     
-                        <b>10.1.</b>
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                     Hivemall on Apache Spark
             
@@ -1586,12 +1644,12 @@
             
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-                        <b>10.2.</b>
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/binaryclass/titanic_rf.html
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+            
+                <a href="../ft_engineering/feature_selection.html">
+            
+                    
+                        <b>3.5.</b>
+                    
+                    Feature selection
+            
+                </a>
+            
+
+            
+        </li>
+    
 
     
         
@@ -1567,16 +1582,59 @@
 
     
         
+        <li class="header">Part X - Hivemall on Spark</li>
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+    
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+            
+                <a href="../spark/misc/misc.html">
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+                    
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/binaryclass/webspam.html
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index 729dcd5..a633d84 100644
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+++ b/userguide/binaryclass/webspam.html
@@ -634,6 +634,21 @@
             
         </li>
     
+        <li class="chapter " data-level="3.5" 
data-path="../ft_engineering/feature_selection.html">
+            
+                <a href="../ft_engineering/feature_selection.html">
+            
+                    
+                        <b>3.5.</b>
+                    
+                    Feature selection
+            
+                </a>
+            
+
+            
+        </li>
+    
 
     
         
@@ -1567,16 +1582,59 @@
 
     
         
+        <li class="header">Part X - Hivemall on Spark</li>
+        
+        
+    
+        <li class="chapter " data-level="10.1" 
data-path="../spark/misc/misc.html">
+            
+                <a href="../spark/misc/misc.html">
+            
+                    
+                        <b>10.1.</b>
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+                
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+                <a href="../spark/misc/topk_join.html">
+            
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+                        <b>10.1.1.</b>
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+                    Top-k Join processing
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+            
+
+            
+        </li>
+    
+
+            </ul>
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+        </li>
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+
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+        
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-        <li class="chapter " data-level="10.1" >
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                 <a target="_blank" 
href="https://github.com/maropu/hivemall-spark";>
             
                     
-                        <b>10.1.</b>
+                        <b>11.1.</b>
                     
                     Hivemall on Apache Spark
             
@@ -1586,12 +1644,12 @@
             
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-                        <b>10.2.</b>
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+                    
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+                </a>
+            
+
+            
+        </li>
+    
 
     
         
@@ -1567,16 +1582,59 @@
 
     
         
+        <li class="header">Part X - Hivemall on Spark</li>
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+        
+    
+        <li class="chapter " data-level="10.1" 
data-path="../spark/misc/misc.html">
+            
+                <a href="../spark/misc/misc.html">
+            
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+                    Generic features
+            
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+            
+
+            
+            <ul class="articles">
+                
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/binaryclass/webspam_scw.html
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+                    
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+            
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+            
+
+            
+        </li>
+    
 
     
         
@@ -1567,16 +1582,59 @@
 
     
         
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+        <li class="chapter " data-level="10.1" 
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+            
+                <a href="../spark/misc/misc.html">
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+                    
+                    Generic features
+            
+                </a>
+            
+
+            
+            <ul class="articles">
+                
+    
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+            
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+            
+                    
+                        <b>10.1.1.</b>
+                    
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+            
+
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+    
+
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@@ -1567,16 +1582,59 @@
 
     
         
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+            
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+            
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@@ -1567,16 +1582,59 @@
 
     
         
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diff --git a/userguide/eval/stat_eval.html b/userguide/eval/stat_eval.html
index 168099a..d6dfde2 100644
--- a/userguide/eval/stat_eval.html
+++ b/userguide/eval/stat_eval.html
@@ -100,7 +100,7 @@
     <link rel="next" href="datagen.html" />
     
     
-    <link rel="prev" href="../ft_engineering/quantify.html" />
+    <link rel="prev" href="../ft_engineering/feature_selection.html" />
     
 
     </head>
@@ -634,6 +634,21 @@
             
         </li>
     
+        <li class="chapter " data-level="3.5" 
data-path="../ft_engineering/feature_selection.html">
+            
+                <a href="../ft_engineering/feature_selection.html">
+            
+                    
+                        <b>3.5.</b>
+                    
+                    Feature selection
+            
+                </a>
+            
+
+            
+        </li>
+    
 
     
         
@@ -1567,16 +1582,59 @@
 
     
         
+        <li class="header">Part X - Hivemall on Spark</li>
+        
+        
+    
+        <li class="chapter " data-level="10.1" 
data-path="../spark/misc/misc.html">
+            
+                <a href="../spark/misc/misc.html">
+            
+                    
+                        <b>10.1.</b>
+                    
+                    Generic features
+            
+                </a>
+            
+
+            
+            <ul class="articles">
+                
+    
+        <li class="chapter " data-level="10.1.1" 
data-path="../spark/misc/topk_join.html">
+            
+                <a href="../spark/misc/topk_join.html">
+            
+                    
+                        <b>10.1.1.</b>
+                    
+                    Top-k Join processing
+            
+                </a>
+            
+
+            
+        </li>
+    
+
+            </ul>
+            
+        </li>
+    
+
+    
+        
         <li class="header">Part X - External References</li>
         
         
     
-        <li class="chapter " data-level="10.1" >
+        <li class="chapter " data-level="11.1" >
             
                 <a target="_blank" 
href="https://github.com/maropu/hivemall-spark";>
             
                     
-                        <b>10.1.</b>
+                        <b>11.1.</b>
                     
                     Hivemall on Apache Spark
             
@@ -1586,12 +1644,12 @@
             
         </li>
     
-        <li class="chapter " data-level="10.2" >
+        <li class="chapter " data-level="11.2" >
             
                 <a target="_blank" 
href="https://github.com/daijyc/hivemall/wiki/PigHome";>
             
                     
-                        <b>10.2.</b>
+                        <b>11.2.</b>
                     
                     Hivemall on Apache Pig
             
@@ -1781,7 +1839,7 @@ Apache Hivemall is an effort undergoing incubation at The 
Apache Software Founda
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/ft_engineering/feature_selection.html
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diff --git a/userguide/ft_engineering/feature_selection.html 
b/userguide/ft_engineering/feature_selection.html
index 966af4b..56375e5 100644
--- a/userguide/ft_engineering/feature_selection.html
+++ b/userguide/ft_engineering/feature_selection.html
@@ -1582,16 +1582,59 @@
 
     
         
+        <li class="header">Part X - Hivemall on Spark</li>
+        
+        
+    
+        <li class="chapter " data-level="10.1" 
data-path="../spark/misc/misc.html">
+            
+                <a href="../spark/misc/misc.html">
+            
+                    
+                        <b>10.1.</b>
+                    
+                    Generic features
+            
+                </a>
+            
+
+            
+            <ul class="articles">
+                
+    
+        <li class="chapter " data-level="10.1.1" 
data-path="../spark/misc/topk_join.html">
+            
+                <a href="../spark/misc/topk_join.html">
+            
+                    
+                        <b>10.1.1.</b>
+                    
+                    Top-k Join processing
+            
+                </a>
+            
+
+            
+        </li>
+    
+
+            </ul>
+            
+        </li>
+    
+
+    
+        
         <li class="header">Part X - External References</li>
         
         
     
-        <li class="chapter " data-level="10.1" >
+        <li class="chapter " data-level="11.1" >
             
                 <a target="_blank" 
href="https://github.com/maropu/hivemall-spark";>
             
                     
-                        <b>10.1.</b>
+                        <b>11.1.</b>
                     
                     Hivemall on Apache Spark
             
@@ -1601,12 +1644,12 @@
             
         </li>
     
-        <li class="chapter " data-level="10.2" >
+        <li class="chapter " data-level="11.2" >
             
                 <a target="_blank" 
href="https://github.com/daijyc/hivemall/wiki/PigHome";>
             
                     
-                        <b>10.2.</b>
+                        <b>11.2.</b>
                     
                     Hivemall on Apache Pig
             
@@ -1681,7 +1724,7 @@
 -->
 <p><a href="https://en.wikipedia.org/wiki/Feature_selection"; 
target="_blank">Feature Selection</a> is the process of selecting a subset of 
relevant features for use in model construction. </p>
 <p>It is a useful technique to 1) improve prediction results by omitting 
redundant features, 2) to shorten training time, and 3) to know important 
features for prediction.</p>
-<p><em>Note: The feature is supported Hivemall from v0.5-rc.1 or 
later.</em></p>
+<p><em>Note: This feature is supported from Hivemall v0.5-rc.1 or 
later.</em></p>
 <!-- toc --><div id="toc" class="toc">
 
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@@ -1941,7 +1984,7 @@ Apache Hivemall is an effort undergoing incubation at The 
Apache Software Founda
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