diff --git a/bin/oxtimelines b/bin/oxtimelines
index 6523c06..4af5443 100755
--- a/bin/oxtimelines
+++ b/bin/oxtimelines
@@ -36,7 +36,8 @@ second (smaller) one. If the wide option is set, large 'keyframeswide' tiles
 will be rendered. They can be used at a later point to render small 'keyframes'
 tiles without having to decode the video again.
 
-usage: %prog [options] video1 video2'''
+usage: %prog [options] video1 [video2]'''
+
     parser = OptionParser(usage=usage)
     parser.add_option('-o', '--output', dest='tiles', help='path for combined timeline tiles')
     parser.add_option('-c', '--cuts', dest='cuts', help='path for combined cuts json file')