diff --git a/src/rfc3987_syntax2/syntax_helpers.py b/src/rfc3987_syntax2/syntax_helpers.py
index 2e3876e..25830e7 100644
--- a/src/rfc3987_syntax2/syntax_helpers.py
+++ b/src/rfc3987_syntax2/syntax_helpers.py
@@ -14,7 +14,7 @@
     "absolute_iri",
     "scheme",
     "irelative_ref",
-    "irelative_part"
+    "irelative_part",
     "ihier_part",
     "iauthority",
     "iuserinfo",