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-rw-r--r--doc/lua_api.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/lua_api.txt b/doc/lua_api.txt
index d25cd741c..74487edee 100644
--- a/doc/lua_api.txt
+++ b/doc/lua_api.txt
@@ -258,6 +258,10 @@ Advanced texture modifiers:
Crops the texture to a frame of a vertical animation.
Example: default_torch_animated.png^[verticalframe:16:8
+ [mask:<file>
+ Apply a mask to the base image.
+ The mask is applied using binary AND.
+
Sounds
-------
Only OGG Vorbis files are supported.