diff --git a/build/index.txt b/build/index.txt
index fbce269..f8f7606 100644
--- a/build/index.txt
+++ b/build/index.txt
@@ -14,5 +14,5 @@ portable and building is much easier.
     * [[Building on MacOS][macos.txt]]
     * [[Building on MS-Windows][windows.txt]]
     * [[Android][linuxonandroid.txt]]
-    * [[WASM (WebAssembly)][WebAssembly.txt]]
+    * [[WASM (WebAssembly)][WebAssembly.md]]