--- a/libervia/backend/memory/encryption.py	Wed Dec 11 01:17:09 2024 +0200
+++ b/libervia/backend/memory/encryption.py	Mon Jan 13 01:23:10 2025 +0100
@@ -77,7 +77,14 @@
             log.info(_("encryption sessions restored"))
 
     @classmethod
-    def register_plugin(cls, plg_instance, name, namespace, priority=0, directed=False):
+    def register_plugin(
+        cls,
+        plg_instance,
+        name: str,
+        namespace: str,
+        priority: int=0,
+        directed: bool=False
+    ) -> None:
         """Register a plugin handling an encryption algorithm
 
         @param plg_instance(object): instance of the plugin
@@ -92,12 +99,12 @@
                     entity(jid.JID): entity to stop encrypted session with
             if they don't exists, those 2 methods will be ignored.
 
-        @param name(unicode): human readable name of the encryption algorithm
-        @param namespace(unicode): namespace of the encryption algorithm
-        @param priority(int): priority of this plugin to encrypt an message when not
+        @param name: human readable name of the encryption algorithm
+        @param namespace: namespace of the encryption algorithm
+        @param priority: priority of this plugin to encrypt an message when not
             selected manually
-        @param directed(bool): True if this plugin is directed (if it works with one
-                               device only at a time)
+        @param directed: True if this plugin is directed (if it works with one
+            device only at a time)
         """
         existing_ns = set()
         existing_names = set()