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-rw-r--r--src/dispextern.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/dispextern.h b/src/dispextern.h
index 1e9fa483b27..d6c93cb270e 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -1967,8 +1967,8 @@ struct it
/* Object and position where the current display element came from.
Object can be a Lisp string in case the current display element
- comes from an overlay string, or it is buffer. Position is
- a position in object. */
+ comes from an overlay string, or it is buffer. It may also be nil
+ during mode-line update. Position is a position in object. */
Lisp_Object object;
struct text_pos position;