diff --git a/docs/ja/programmers/advanced-features.xml b/docs/ja/programmers/advanced-features.xml
index ca72ce6d..9a871e2b 100644
--- a/docs/ja/programmers/advanced-features.xml
+++ b/docs/ja/programmers/advanced-features.xml
@@ -3,7 +3,7 @@
 <!-- EN-Revision: 1.4 Maintainer: takagi Status: ready -->
 <!-- CREDITS: mat-sh,daichi,joe -->
   <chapter id="advanced.features">
-   <title>隲｡?｡陟托ｽｵ隶匁ｺｯ?</title>
+   <title>拡張機能</title>
 &programmers.advanced-features.advanced-features-objects;
 &programmers.advanced-features.advanced-features-prefilters;
 
diff --git a/docs/ja/programmers/api-functions.xml b/docs/ja/programmers/api-functions.xml
index af3055a5..265418e2 100644
--- a/docs/ja/programmers/api-functions.xml
+++ b/docs/ja/programmers/api-functions.xml
@@ -3,7 +3,7 @@
 <!-- EN-Revision: 1.10 Maintainer: takagi Status: ready -->
 <!-- CREDITS: mat-sh,daichi,joe -->
    <chapter id="api.functions">
-     <title>Smarty 繧ｯ繝ｩ繧ｹ繝｡繧ｽ繝?ラ</title>
+     <title>Smarty クラスメソッド</title>
 &programmers.api-functions.api-append;
 &programmers.api-functions.api-append-by-ref;
 &programmers.api-functions.api-assign;
diff --git a/docs/ja/programmers/api-variables.xml b/docs/ja/programmers/api-variables.xml
index d5ce0ad5..6c4a7724 100644
--- a/docs/ja/programmers/api-variables.xml
+++ b/docs/ja/programmers/api-variables.xml
@@ -3,7 +3,7 @@
 <!-- EN-Revision: 1.4 Maintainer: takagi Status: ready -->
 <!-- CREDITS: mat-sh,daichi,joe -->
   <chapter id="api.variables">
-   <title>Smarty 繧ｯ繝ｩ繧ｹ螟画焚</title>
+   <title>Smarty クラス変数</title>
 
 &programmers.api-variables.variable-template-dir;
 &programmers.api-variables.variable-compile-dir;