Update runtime files
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 8a106e1..774e782 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -7339,8 +7339,8 @@
After this option has been set successfully, Vim will source the files
"spell/LANG.vim" in 'runtimepath'. "LANG" is the value of 'spelllang'
- up to the first character that is not an ASCII letter and not a dash.
- Also see |set-spc-auto|.
+ up to the first character that is not an ASCII letter or number and
+ not a dash. Also see |set-spc-auto|.
*'spellsuggest'* *'sps'*