diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 84deeca..e2206f0 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -1,4 +1,4 @@
-*options.txt*	For Vim version 9.1.  Last change: 2025 Mar 28
+*options.txt*	For Vim version 9.1.  Last change: 2025 Apr 04
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -2989,7 +2989,10 @@
 					difference.
 				word    Use internal diff to perform a
 					|word|-wise diff and highlight the
-					difference.
+					difference.  Non-alphanumeric
+					multi-byte characters such as emoji
+					and CJK characters are considered
+					individual words.
 
 		internal	Use the internal diff library.  This is
 				ignored when 'diffexpr' is set.  *E960*