diff --git a/docs/sample_config.yaml b/docs/sample_config.yaml
index 1c51772702..69352fb196 100644
--- a/docs/sample_config.yaml
+++ b/docs/sample_config.yaml
@@ -643,7 +643,7 @@ acme:
 #  - syd.example.com
 
 # Prevent outgoing requests from being sent to the following blacklisted IP address
-# CIDR ranges. If this option is not specified, or specified with an empty list, 
+# CIDR ranges. If this option is not specified, or specified with an empty list,
 # no IP range blacklist will be enforced.
 #
 # The outbound requests for federation, identity servers, push servers, and for
diff --git a/synapse/config/federation.py b/synapse/config/federation.py
index 61c2b40ee3..045c20e127 100644
--- a/synapse/config/federation.py
+++ b/synapse/config/federation.py
@@ -85,7 +85,7 @@ class FederationConfig(Config):
         #  - syd.example.com
 
         # Prevent outgoing requests from being sent to the following blacklisted IP address
-        # CIDR ranges. If this option is not specified, or specified with an empty list, 
+        # CIDR ranges. If this option is not specified, or specified with an empty list,
         # no IP range blacklist will be enforced.
         #
         # The outbound requests for federation, identity servers, push servers, and for