http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/ft_engineering/ft_trans.html
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diff --git a/userguide/ft_engineering/ft_trans.html 
b/userguide/ft_engineering/ft_trans.html
index 2104371..b3fd882 100644
--- a/userguide/ft_engineering/ft_trans.html
+++ b/userguide/ft_engineering/ft_trans.html
@@ -634,6 +634,21 @@
             
         </li>
     
+        <li class="chapter " data-level="3.5" 
data-path="feature_selection.html">
+            
+                <a href="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
             
@@ -1719,7 +1777,7 @@ 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/hashing.html
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diff --git a/userguide/ft_engineering/hashing.html 
b/userguide/ft_engineering/hashing.html
index b59c9d2..d7a42bb 100644
--- a/userguide/ft_engineering/hashing.html
+++ b/userguide/ft_engineering/hashing.html
@@ -634,6 +634,21 @@
             
         </li>
     
+        <li class="chapter " data-level="3.5" 
data-path="feature_selection.html">
+            
+                <a href="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
             
@@ -1800,7 +1858,7 @@ 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/quantify.html
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diff --git a/userguide/ft_engineering/quantify.html 
b/userguide/ft_engineering/quantify.html
index 3e64b5e..72e6100 100644
--- a/userguide/ft_engineering/quantify.html
+++ b/userguide/ft_engineering/quantify.html
@@ -97,7 +97,7 @@
     <link rel="shortcut icon" href="../gitbook/images/favicon.ico" 
type="image/x-icon">
 
     
-    <link rel="next" href="../eval/stat_eval.html" />
+    <link rel="next" href="feature_selection.html" />
     
     
     <link rel="prev" href="vectorizer.html" />
@@ -634,6 +634,21 @@
             
         </li>
     
+        <li class="chapter " data-level="3.5" 
data-path="feature_selection.html">
+            
+                <a href="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
             
@@ -1665,7 +1723,7 @@
   under the License.
 -->
 <p><code>quantified_features</code> is useful for transforming values of 
non-number columns to indexed numbers.</p>
-<p><em>Note: The feature is supported Hivemall v0.4 or later.</em></p>
+<p><em>Note: The feature is supported from Hivemall v0.4 or later.</em></p>
 <pre><code class="lang-sql">desc train;
 
 id                      int                                         
@@ -1867,7 +1925,7 @@ 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/scaling.html
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index 0745734..7cdb16d 100644
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@@ -634,6 +634,21 @@
             
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@@ -1567,16 +1582,59 @@
 
     
         
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@@ -1586,12 +1644,12 @@
             
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/ft_engineering/tfidf.html
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@@ -1567,16 +1582,59 @@
 
     
         
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/ft_engineering/vectorizer.html
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b/userguide/ft_engineering/vectorizer.html
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@@ -1567,16 +1582,59 @@
 
     
         
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@@ -1567,16 +1582,59 @@
 
     
         
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/getting_started/input-format.html
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/getting_started/installation.html
----------------------------------------------------------------------
diff --git a/userguide/getting_started/installation.html 
b/userguide/getting_started/installation.html
index d37fe4b..291fd37 100644
--- a/userguide/getting_started/installation.html
+++ b/userguide/getting_started/installation.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>
+                    
+                    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
             
@@ -1734,7 +1792,7 @@ Apache Hivemall is an effort undergoing incubation at The 
Apache Software Founda
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