diff --git a/_Sidebar.md b/_Sidebar.md
index df1466b..41d4ed3 100644
--- a/_Sidebar.md
+++ b/_Sidebar.md
@@ -70,6 +70,7 @@
 * [System statistics](https://github.com/koreader/koreader/wiki/System-statistics)
 * [Terminal emulator](https://github.com/koreader/koreader/wiki/Terminal-emulator)
 * [Time sync](https://github.com/koreader/koreader/wiki/Time-sync)
+* [Vocabulary builder](https://github.com/koreader/koreader/wiki/Vocabulary-builder)
 * [Wallabag](https://github.com/koreader/koreader/wiki/Wallabag)
 
 # [Development](https://github.com/koreader/koreader/wiki#hackers)