diff --git a/files/lua_api/openmw/core.lua b/files/lua_api/openmw/core.lua
index 9fce8e70a8..88f2a63371 100644
--- a/files/lua_api/openmw/core.lua
+++ b/files/lua_api/openmw/core.lua
@@ -52,7 +52,7 @@
 -- @return #number
 
 ---
--- Frame duration in seconds
+-- Frame duration in seconds. Not available in global scripts.
 -- @function [parent=#core] getRealFrameDuration
 -- @return #number
 
diff --git a/files/lua_api/openmw/world.lua b/files/lua_api/openmw/world.lua
index f6269375ec..b497dfeacd 100644
--- a/files/lua_api/openmw/world.lua
+++ b/files/lua_api/openmw/world.lua
@@ -118,11 +118,6 @@
 -- @function [parent=#world] setGameTimeScale
 -- @param #number ratio
 
----
--- Frame duration in seconds
--- @function [parent=#world] getRealFrameDuration
--- @return #number
-
 ---
 -- Whether the world is paused (onUpdate doesn't work when the world is paused).
 -- @function [parent=#world] isWorldPaused