diff --git a/src/vector.c b/src/vector.c
index c3e0fa9..fd81a5c 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -1197,7 +1197,7 @@ vector_accum(PG_FUNCTION_ARGS)
 }
 
 /*
- * Combine vectors or half vectors
+ * Combine vectors or half vectors (also used for halfvec_combine)
  */
 PGDLLEXPORT PG_FUNCTION_INFO_V1(vector_combine);
 Datum