diff --git a/libp2p/security/secio/exceptions.py b/libp2p/security/secio/exceptions.py
index c03fda4..d86ce3b 100644
--- a/libp2p/security/secio/exceptions.py
+++ b/libp2p/security/secio/exceptions.py
@@ -28,3 +28,7 @@ class IncompatibleChoices(SecioException):
 
 class InconsistentNonce(SecioException):
     pass
+
+
+class SedesException(SecioException):
+    pass