1 files changed, 1 insertions, 0 deletions
diff --git a/bin/README b/bin/README
index 0ea3970a..3e53eba2 100644
--- a/bin/README
+++ b/bin/README
@@ -76,6 +76,7 @@ PNG glitcher based on pngo.
     -r         reconstruct when filtering
     -d LIST    declare pattern of comma-separated filters
     -a LIST    apply pattern of comma-separated filters
+    -m         mirror scanlines after filtering
 
                                   hnel