1 files changed, 1 insertions, 1 deletions
diff --git a/worktree.h b/worktree.h
index 6bfb985203..5ea5e503fb 100644
--- a/worktree.h
+++ b/worktree.h
@@ -4,7 +4,7 @@
 struct worktree {
 	char *path;
 	char *id;
-	char *head_ref;
+	char *head_ref;		/* NULL if HEAD is broken or detached */
 	char *lock_reason;	/* internal use */
 	unsigned char head_sha1[20];
 	int is_detached;