* src/doc.c (Fsubstitute_command_keys): Clarify GC comments.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/doc.c b/src/doc.c
index 4b91831c703..6376398cc22 100644
--- a/src/doc.c
+++ b/src/doc.c
@@ -821,7 +821,8 @@ Otherwise, return a new string.  */)
               goto do_remap;
             }
 
-          /* Take relocation of string contents into account.  */
+          /* Fwhere_is_internal can GC, so take relocation of string
+             contents into account.  */
           strp = SDATA (str) + idx;
           start = strp - length_byte - 1;
 
@@ -936,7 +937,8 @@ Otherwise, return a new string.  */)
             bufp += length_byte;
             nchars += length;
 
-            /* Take relocation of string contents into account.  */
+            /* Some of the previous code can GC, so take relocation of
+               string contents into account.  */
             strp = SDATA (str) + idx;
 
             continue;