-modifier key. If \code{ALTMETA} is set, it is used as modifier for the keys
-that don't normally use a modifier. for details on modifiers and key
-binding setup in general see section \ref{sec:bindings}.
+modifier key. If \code{ALTMETA} is set, it is used as modifier for the
+keys that don't normally use a modifier. Note that these two are Lua
+variables used in the configuration files only, and not Ion settings.
+For details on modifiers and key binding setup in general, see section
+\ref{sec:bindings}.