diff --git a/rend-spec.txt b/rend-spec.txt
index 99a13d1..a203453 100644
--- a/rend-spec.txt
+++ b/rend-spec.txt
@@ -348,7 +348,7 @@
            The identifier of this introduction point: the base32 encoded
            hash of this introduction point's identity key.
 
-         "ip-address" SP ip-address NL
+         "ip-address" SP ip4 NL
 
            [Exactly once]