diff --git a/commit.h b/commit.h
index 838f6a6b266e220711653c4e67d6c8fe6d725196..4432458367f16ca23336737ee4d4e111aca85f06 100644
--- a/commit.h
+++ b/commit.h
@@ -16,9 +16,13 @@ struct commit_list {
 	struct commit_list *next;
 };
 
+/*
+ * The size of this struct matters in full repo walk operations like
+ * 'git clone' or 'git gc'. Consider using commit-slab to attach data
+ * to a commit instead of adding new fields here.
+ */
 struct commit {
 	struct object object;
-	void *util;
 	unsigned int index;
 	timestamp_t date;
 	struct commit_list *parents;