diff --git a/xcp/net/ifrename/dynamic.py b/xcp/net/ifrename/dynamic.py
index 6578da57..ad8f61ba 100644
--- a/xcp/net/ifrename/dynamic.py
+++ b/xcp/net/ifrename/dynamic.py
@@ -238,7 +238,6 @@ def generate(self, state):
 
             LOG.critical("Unknown dynamic rule method %s" % method)
 
-
     def write(self, header = True):
         """
         Write the dynamic rules to a string
diff --git a/xcp/net/ifrename/static.py b/xcp/net/ifrename/static.py
index 59fda548..76ab3723 100644
--- a/xcp/net/ifrename/static.py
+++ b/xcp/net/ifrename/static.py
@@ -292,6 +292,9 @@ def generate(self, state):
             LOG.critical("Unknown static rule method %s" % method)
 
     def write(self, header = True):
+        """
+        Write the static rules to a string
+        """
 
         res = ""
 
@@ -320,6 +323,10 @@ def write(self, header = True):
         return res
 
     def save(self, header = True):
+        """
+        Save the static rules to a file/path.
+        Returns boolean indicating success or failure.
+        """
 
         fd = None