Document order of preference for format selection (closes #798)

1 files changed, 2 insertions, 1 deletions

diff --git a/README.md b/README.md
index 5c7d8b66a..0ab4b660c 100644
--- a/README.md
+++ b/README.md
@@ -98,7 +98,8 @@ which means you can modify it, redistribute it or use it however you like.
                                verbose)
 
 ## Video Format Options:
-    -f, --format FORMAT        video format code
+    -f, --format FORMAT        video format code, specifiy the order of
+                               preference using slashes: "-f 22/17/18"
     --all-formats              download all available video formats
     --prefer-free-formats      prefer free video formats unless a specific one
                                is requested