keymap property

lispref/text.texi

@@ -2700,6 +2700,12 @@ of the buffer's local map.  If the property value is a symbol, the
 symbol's function definition is used as the keymap.  @xref{Active
 Keymaps}.
 
+@item keymap
+@kindex keymap @r{(text property)}
+The @code{keymap} property is similar to @code{local-map} but overrides the
+buffer's local map (and the map specified by the @code{local-map}
+property) rather than replacing it.
+
 @item syntax-table
 The @code{syntax-table} property overrides what the syntax table says
 about this particular character.  @xref{Syntax Properties}.