http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/tips/general_tips.html
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diff --git a/userguide/tips/general_tips.html b/userguide/tips/general_tips.html
index 0769b6c..f917310 100644
--- a/userguide/tips/general_tips.html
+++ b/userguide/tips/general_tips.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" >
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                 <a target="_blank" 
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-                        <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 
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/tips/hadoop_tuning.html
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index b620e42..c04c2b2 100644
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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>
+                    
+                    Generic features
+            
+                </a>
+            
+
+            
+            <ul class="articles">
+                
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+            
+                <a href="../spark/misc/topk_join.html">
+            
+                    
+                        <b>10.1.1.</b>
+                    
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+            
+                </a>
+            
+
+            
+        </li>
+    
+
+            </ul>
+            
+        </li>
+    
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+    
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                 <a target="_blank" 
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-                        <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/tips/index.html
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diff --git a/userguide/tips/index.html b/userguide/tips/index.html
index 5994e49..3b72efa 100644
--- a/userguide/tips/index.html
+++ b/userguide/tips/index.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 @@
             
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-                        <b>10.2.</b>
+                        <b>11.2.</b>
                     
                     Hivemall on Apache Pig
             
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/tips/mixserver.html
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index 14479ed..aea7e8a 100644
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+++ b/userguide/tips/mixserver.html
@@ -634,6 +634,21 @@
             
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+                        <b>3.5.</b>
+                    
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+            
+
+            
+        </li>
+    
 
     
         
@@ -1567,16 +1582,59 @@
 
     
         
+        <li class="header">Part X - Hivemall on Spark</li>
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data-path="../spark/misc/misc.html">
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-                        <b>10.1.</b>
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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/tips/rand_amplify.html
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+                    
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+            
+
+            
+        </li>
+    
 
     
         
@@ -1567,16 +1582,59 @@
 
     
         
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-                        <b>10.1.</b>
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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/tips/rowid.html
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@@ -634,6 +634,21 @@
             
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+                        <b>3.5.</b>
+                    
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+            
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+            
+
+            
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+    
 
     
         
@@ -1567,16 +1582,59 @@
 
     
         
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+                        <b>3.5.</b>
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+            
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+            
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+    
 
     
         
@@ -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">
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+                <a href="../spark/misc/misc.html">
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+            
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@@ -1567,16 +1582,59 @@
 
     
         
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+                <a href="../spark/misc/misc.html">
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+        </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 
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/troubleshooting/mapjoin_classcastex.html
----------------------------------------------------------------------
diff --git a/userguide/troubleshooting/mapjoin_classcastex.html 
b/userguide/troubleshooting/mapjoin_classcastex.html
index f3c7799..44f0a70 100644
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+++ b/userguide/troubleshooting/mapjoin_classcastex.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" >
             
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-                        <b>10.2.</b>
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