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'*