search.c (search_buffer): Improve a comment.

diff --git a/src/search.c b/src/search.c
index 7f26601cc6941849f379df45b23e9d35925fdc14..c6c3062e64989741717e070e58c3316d5c4bb3e8 100644 (file)
--- a/src/search.c
+++ b/src/search.c
@@ -1313,8 +1313,9 @@ search_buffer (Lisp_Object string, ptrdiff_t pos, ptrdiff_t pos_byte,
             non-nil, we can use boyer-moore search only if TRT can be
             represented by the byte array of 256 elements.  For that,
             all non-ASCII case-equivalents of all case-sensitive
-            characters in STRING must belong to the same charset and
-            row.  */
+            characters in STRING must belong to the same character
+            group (every 64 characters form a group; U+0000..U+003F,
+            U+0040..U+007F, U+0080..U+00BF, ...).  */
 
          while (--len >= 0)
            {