diff --git a/src/vector.c b/src/vector.c
index 2f1e886..95aa301 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -724,7 +724,7 @@ vector_spherical_distance(PG_FUNCTION_ARGS)
 }
 
 /*
- * Get the L1 distance between vectors
+ * Get the L1 distance between two vectors
  */
 PGDLLEXPORT PG_FUNCTION_INFO_V1(l1_distance);
 Datum