diff --git a/src/git_kv.mli b/src/git_kv.mli
index 97c456a..bfc0020 100644
--- a/src/git_kv.mli
+++ b/src/git_kv.mli
@@ -41,6 +41,7 @@ val connect : Mimic.ctx -> string -> t Lwt.t
     we can not fetch the given [remote]. *)
 
 val branch : t -> Git.Reference.t
+(** [branch t] returns the branch used by the given [t]. *)
 
 val to_octets : t -> string Lwt.t
 (** [to_octets store] returns a serialized version of the given [store]. *)