Update runtime files
diff --git a/runtime/doc/map.txt b/runtime/doc/map.txt
index 8f2fe75..aa05029 100644
--- a/runtime/doc/map.txt
+++ b/runtime/doc/map.txt
@@ -1,4 +1,4 @@
-*map.txt* For Vim version 9.0. Last change: 2023 Mar 09
+*map.txt* For Vim version 9.0. Last change: 2023 May 12
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -1873,8 +1873,14 @@
XX a\\\ b 'a\ b'
XX a\\\\b 'a\\b'
XX a\\\\ b 'a\\', 'b'
+ XX [nothing]
+Note that if the "no arguments" situation is to be handled, you have to make
+sure that the function can be called without arguments. For a compiled
+function you might want to use variable arguments, see
+|vim9-variable-arguments|.
+
Examples for user commands: >
" Delete everything after here to the end