http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/0e287d3d/userguide/binaryclass/news20_dataset.html
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diff --git a/userguide/binaryclass/news20_dataset.html 
b/userguide/binaryclass/news20_dataset.html
index b735c63..c65c0e8 100644
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+++ b/userguide/binaryclass/news20_dataset.html
@@ -715,14 +715,45 @@
             
         </li>
     
-        <li class="chapter " data-level="3.7" 
data-path="../ft_engineering/tfidf.html">
+        <li class="chapter " data-level="3.7" 
data-path="../ft_engineering/term_vector.html">
             
-                <a href="../ft_engineering/tfidf.html">
+                <a href="../ft_engineering/term_vector.html">
             
                     
                         <b>3.7.</b>
                     
-                    TF-IDF Calculation
+                    Term Vector Model
+            
+                </a>
+            
+
+            
+            <ul class="articles">
+                
+    
+        <li class="chapter " data-level="3.7.1" 
data-path="../ft_engineering/tfidf.html">
+            
+                <a href="../ft_engineering/tfidf.html">
+            
+                    
+                        <b>3.7.1.</b>
+                    
+                    TF-IDF Term Weighting
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="3.7.2" 
data-path="../ft_engineering/bm25.html">
+            
+                <a href="../ft_engineering/bm25.html">
+            
+                    
+                        <b>3.7.2.</b>
+                    
+                    Okapi BM25 Term Weighting
             
                 </a>
             
@@ -731,6 +762,11 @@
         </li>
     
 
+            </ul>
+            
+        </li>
+    
+
     
         
         <li class="header">Part IV - Evaluation</li>
@@ -2413,7 +2449,7 @@ 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/0e287d3d/userguide/binaryclass/news20_pa.html
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diff --git a/userguide/binaryclass/news20_pa.html 
b/userguide/binaryclass/news20_pa.html
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@@ -715,14 +715,45 @@
             
         </li>
     
-        <li class="chapter " data-level="3.7" 
data-path="../ft_engineering/tfidf.html">
+        <li class="chapter " data-level="3.7" 
data-path="../ft_engineering/term_vector.html">
             
-                <a href="../ft_engineering/tfidf.html">
+                <a href="../ft_engineering/term_vector.html">
             
                     
                         <b>3.7.</b>
                     
-                    TF-IDF Calculation
+                    Term Vector Model
+            
+                </a>
+            
+
+            
+            <ul class="articles">
+                
+    
+        <li class="chapter " data-level="3.7.1" 
data-path="../ft_engineering/tfidf.html">
+            
+                <a href="../ft_engineering/tfidf.html">
+            
+                    
+                        <b>3.7.1.</b>
+                    
+                    TF-IDF Term Weighting
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="3.7.2" 
data-path="../ft_engineering/bm25.html">
+            
+                <a href="../ft_engineering/bm25.html">
+            
+                    
+                        <b>3.7.2.</b>
+                    
+                    Okapi BM25 Term Weighting
             
                 </a>
             
@@ -731,6 +762,11 @@
         </li>
     
 
+            </ul>
+            
+        </li>
+    
+
     
         
         <li class="header">Part IV - Evaluation</li>
@@ -2536,7 +2572,7 @@ Apache Hivemall is an effort undergoing incubation at The 
Apache Software Founda
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diff --git a/userguide/binaryclass/news20_rf.html 
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data-path="../ft_engineering/term_vector.html">
             
-                <a href="../ft_engineering/tfidf.html">
+                <a href="../ft_engineering/term_vector.html">
             
                     
                         <b>3.7.</b>
                     
-                    TF-IDF Calculation
+                    Term Vector Model
+            
+                </a>
+            
+
+            
+            <ul class="articles">
+                
+    
+        <li class="chapter " data-level="3.7.1" 
data-path="../ft_engineering/tfidf.html">
+            
+                <a href="../ft_engineering/tfidf.html">
+            
+                    
+                        <b>3.7.1.</b>
+                    
+                    TF-IDF Term Weighting
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="3.7.2" 
data-path="../ft_engineering/bm25.html">
+            
+                <a href="../ft_engineering/bm25.html">
+            
+                    
+                        <b>3.7.2.</b>
+                    
+                    Okapi BM25 Term Weighting
             
                 </a>
             
@@ -731,6 +762,11 @@
         </li>
     
 
+            </ul>
+            
+        </li>
+    
+
     
         
         <li class="header">Part IV - Evaluation</li>
@@ -2405,7 +2441,7 @@ Apache Hivemall is an effort undergoing incubation at The 
Apache Software Founda
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                         <b>3.7.</b>
                     
-                    TF-IDF Calculation
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+                <a href="../ft_engineering/bm25.html">
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+                    
+                        <b>3.7.2.</b>
+                    
+                    Okapi BM25 Term Weighting
             
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@@ -731,6 +762,11 @@
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+            </ul>
+            
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                         <b>3.7.</b>
                     
-                    TF-IDF Calculation
+                    Term Vector Model
+            
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+            
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+    
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+            </ul>
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@@ -731,6 +762,11 @@
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