diff --git a/linkchecker b/linkchecker
index 05a75515..d48b7ef1 100755
--- a/linkchecker
+++ b/linkchecker
@@ -122,6 +122,9 @@ For single-letter option arguments the space is not a necessity. So
         message, for example 'This page has moved' or 'Oracle
         Application Server error'.
         This option implies -w.
+--warning-size-bytes=bytes
+        Print a warning if content size is available and exceeds the given
+        number of bytes.
 """) % (linkcheck.log.LoggerKeys, _profile)
 
 Notes = linkcheck._("""NOTES