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-rw-r--r--include/git2/graph.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/git2/graph.h b/include/git2/graph.h
index 712ae474a..56edb2f87 100644
--- a/include/git2/graph.h
+++ b/include/git2/graph.h
@@ -33,6 +33,7 @@ GIT_BEGIN_DECL
* @param repo the repository where the commits exist
* @param local the commit for local
* @param upstream the commit for upstream
+ * @return 0 or an error code.
*/
GIT_EXTERN(int) git_graph_ahead_behind(size_t *ahead, size_t *behind, git_repository *repo, const git_oid *local, const git_oid *upstream);