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diff --git a/README.md b/README.md
index 346b66f..07238e5 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,7 @@ sxiv supports the following command-line options:
                  (see section GEOMETRY SPECIFICATIONS of X(7))
     -p           Pixelize, i.e. turn off image anti-aliasing
     -q           Be quiet, disable warnings
+    -r           Search given directories recursively for images
     -s           Scale all images to fit into window
     -v           Print version information and exit
     -Z           Same as `-z 100'