diff --git a/c/tskit/tables.h b/c/tskit/tables.h
index 872b9b8fa1..4336bc1249 100644
--- a/c/tskit/tables.h
+++ b/c/tskit/tables.h
@@ -4370,10 +4370,12 @@ TODO DOCUMENT
 @endrst
 
 @param self A pointer to a tsk_table_collection_t object.
+@param max_iter The maximum number of iterations over the tree sequence.
 @param options Bitwise option flags. (UNUSED)
 @return Return 0 on success or a negative value on failure.
 */
-int tsk_table_collection_extend_edges(tsk_table_collection_t *self, int max_iter, tsk_flags_t options);
+int tsk_table_collection_extend_edges(
+    tsk_table_collection_t *self, int max_iter, tsk_flags_t options);
 
 /**
 @brief Subsets and reorders a table collection according to an array of nodes.