diff --git a/game_api.txt b/game_api.txt
index 581d76cc..2f0715f8 100644
--- a/game_api.txt
+++ b/game_api.txt
@@ -348,7 +348,7 @@ To use it, add the `on_screwdriver` function to the node definition.
  * `new_param2` the new value of param2 that would have been set if on_rotate wasn't there
  * return value: false to disallow rotation, nil to keep default behaviour, true to allow
  	it but to indicate that changed have already been made (so the screwdriver will wear out)
- * use `on_rotate = screwdriver.disallow` to always disallow rotation
+ * use `on_rotate = false` to always disallow rotation
  * use `on_rotate = screwdriver.rotate_simple` to allow only face rotation
 
 
diff --git a/mods/screwdriver/init.lua b/mods/screwdriver/init.lua
index 5e6df62f..e73b618f 100644
--- a/mods/screwdriver/init.lua
+++ b/mods/screwdriver/init.lua
@@ -64,6 +64,7 @@ screwdriver.handler = function(itemstack, user, pointed_thing, mode, uses)
 		end
 	else
 		if not ndef or not ndef.paramtype2 == "facedir" or
+				ndef.on_rotate == false or
 				(ndef.drawtype == "nodebox" and
 				not ndef.node_box.type == "fixed") or
 				node.param2 == nil then