1 files changed, 3 insertions, 1 deletions

diff --git a/src/coding.h b/src/coding.h
index c9c19762d80..4e8b1056e43 100644
--- a/src/coding.h
+++ b/src/coding.h
@@ -468,7 +468,9 @@ struct coding_system
      the eol format.  */
   ptrdiff_t head_ascii;
 
-  ptrdiff_t detected_utf8_chars;
+  /* How many bytes/chars at the source are detected as valid utf-8
+     sequence.  Set by detect_coding_utf_8.  */
+  ptrdiff_t detected_utf8_bytes, detected_utf8_chars;
 
   /* Used internally in coding.c.  See the comment of detect_ascii.  */
   int eol_seen;