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-rw-r--r--src/search.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/search.c b/src/search.c
index c6c3062e649..fb76880b612 100644
--- a/src/search.c
+++ b/src/search.c
@@ -1314,7 +1314,9 @@ search_buffer (Lisp_Object string, ptrdiff_t pos, ptrdiff_t pos_byte,
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 character
- group (every 64 characters form a group; U+0000..U+003F,
+ group (two characters belong to the same group iff their
+ multibyte forms are the same except for the last byte;
+ i.e. every 64 characters form a group; U+0000..U+003F,
U+0040..U+007F, U+0080..U+00BF, ...). */
while (--len >= 0)