int add_submodule_odb(const char *path);
-/* Checks if there are submodule changes in a..b. */
+/*
+ * Checks if there are submodule changes in a..b. If a is the null OID,
+ * checks b and all its ancestors instead.
+ */
extern int submodule_touches_in_range(struct object_id *a,
struct object_id *b);
extern int find_unpushed_submodules(struct oid_array *commits,