diff --git a/README.mkd b/README.mkd
index 5236104..fbee4aa 100644
--- a/README.mkd
+++ b/README.mkd
@@ -213,7 +213,7 @@ See the customisation section below for how to change the defaults.
 
 ### Folding
 
-Use the `GitGutterFold` command to fold all unchanged lines, leaving just the hunks visible.  Use `zo` to unfold 3 lines of context above and below a hunk.
+Use the `GitGutterFold` command to fold all unchanged lines, leaving just the hunks visible.  Use `zr` to unfold 3 lines of context above and below a hunk.
 
 Execute `GitGutterFold` a second time to restore the previous view.