1 files changed, 2 insertions, 0 deletions

diff --git a/src/lisp.h b/src/lisp.h
index cf7b8c0ebc5..6203a746a30 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -3050,6 +3050,8 @@ enum specbind_tag {
 
 union specbinding
   {
+    /* Aligning similar members consistently might help efficiency slightly
+       (Bug#31996#25).  */
     ENUM_BF (specbind_tag) kind : CHAR_BIT;
     struct {
       ENUM_BF (specbind_tag) kind : CHAR_BIT;