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-rw-r--r--DOCS/man/lua.rst3
1 files changed, 2 insertions, 1 deletions
diff --git a/DOCS/man/lua.rst b/DOCS/man/lua.rst
index 2e9bfa508f..6b2c5af031 100644
--- a/DOCS/man/lua.rst
+++ b/DOCS/man/lua.rst
@@ -192,7 +192,8 @@ The ``mp`` module is preloaded, although it can be loaded manually with
Register callback to be run on a key binding. The binding will be mapped to
the given ``key``, which is a string describing the physical key. This uses
the same key names as in input.conf, and also allows combinations
- (e.g. ``ctrl+a``).
+ (e.g. ``ctrl+a``). If the key is empty or ``nil``, no physical key is
+ registered, but the user still can create own bindings (see below).
After calling this function, key presses will cause the function ``fn`` to
be called (unless the user remapped the key with another binding).