diff --git a/synapse/types.py b/synapse/types.py
index 111948540d37a14faa328cf6bb22f1f565f4286e..b32c0e360d1ded16558116384db16a9f9b6eefe6 100644
--- a/synapse/types.py
+++ b/synapse/types.py
@@ -156,6 +156,11 @@ class EventID(DomainSpecificString):
     SIGIL = "$"
 
 
+class GroupID(DomainSpecificString):
+    """Structure representing a group ID."""
+    SIGIL = "+"
+
+
 class StreamToken(
     namedtuple("Token", (
         "room_key",