diff --git a/docs/sample_config.yaml b/docs/sample_config.yaml
index 6ed75ff76..45585f09e 100644
--- a/docs/sample_config.yaml
+++ b/docs/sample_config.yaml
@@ -524,7 +524,7 @@ uploads_path: "DATADIR/uploads"
 # (0.0.0.0 and :: are always blacklisted, whether or not they are explicitly
 # listed here, since they correspond to unroutable addresses.)
 #
-# This must be specified if url_preview_enabled is set. It is recommended that 
+# This must be specified if url_preview_enabled is set. It is recommended that
 # you uncomment the following list as a starting point.
 #
 #url_preview_ip_range_blacklist: