diff --git a/Docs/Luadoc/Lua.xml b/Docs/Luadoc/Lua.xml
index f56bed101f..67e9c68c6c 100644
--- a/Docs/Luadoc/Lua.xml
+++ b/Docs/Luadoc/Lua.xml
@@ -191,7 +191,6 @@
 		<Function name='Trace'/>
 		<Function name='TrailToCustomDifficulty'/>
 		<Function name='URLEncode'/>
-		<Function name='UndocumentedFeature'/>
 		<Function name='UnlockRewardTypeToLocalizedString'/>
 		<Function name='update_centering'/>
 		<Function name='Var'/>
diff --git a/src/RageUtil.cpp b/src/RageUtil.cpp
index 9d9fd2cc52..644b97e8ed 100644
--- a/src/RageUtil.cpp
+++ b/src/RageUtil.cpp
@@ -2436,8 +2436,6 @@ LuaFunction( mbstrlen, (int)RStringToWstring(SArg(1)).length() )
 LuaFunction( URLEncode, URLEncode( SArg(1) ) );
 LuaFunction( PrettyPercent, PrettyPercent( FArg(1), FArg(2) ) );
 //LuaFunction( IsHexVal, IsHexVal( SArg(1) ) );
-static bool UndocumentedFeature( RString s ){ sm_crash(s); return true; }
-LuaFunction( UndocumentedFeature, UndocumentedFeature(SArg(1)) );
 LuaFunction( lerp, lerp(FArg(1), FArg(2), FArg(3)) );
 
 int LuaFunc_commify(lua_State* L);