diff --git a/duniterpy/documents/certification.py b/duniterpy/documents/certification.py
index 8407e8e72eac81a1264bb16794fd99bc7881842d..736552e60a8329a3d5e3c293b2c49e6ba0c9a689 100644
--- a/duniterpy/documents/certification.py
+++ b/duniterpy/documents/certification.py
@@ -80,7 +80,7 @@ class Certification(Document):
         """
         Constructor
 
-        :param str version: the UCP version
+        :param int version: the UCP version
         :param str currency: the currency of the blockchain
         :param str pubkey_from:
         :param str pubkey_to: