diff --git a/newswire.py b/newswire.py
index 761446f0..785adcab 100644
--- a/newswire.py
+++ b/newswire.py
@@ -471,7 +471,8 @@ def getRSS(baseDir: str, domain: str, session, url: str,
                                     maxPostsPerSource,
                                     maxFeedItemSizeKb)
             else:
-                print('WARN: feed is too large: ' + url)
+                print('WARN: feed is too large, ' +
+                      'or contains invalid characters: ' + url)
     except requests.exceptions.RequestException as e:
         print('ERROR: getRSS failed\nurl: ' + str(url) + '\n' +
               'headers: ' + str(sessionHeaders) + '\n' +