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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -31,6 +31,7 @@ Usage
 sxiv supports the following command-line options:
 
     -d           Scale all images to 100%, but fit large images into window
+		-F           Use size-hints to make the window fixed/floating
     -f           Start in fullscreen mode
     -g GEOMETRY  Set window position and size
                  (see section GEOMETRY SPECIFICATIONS of X(7))