diff --git a/readme.md b/readme.md
index 45579a6..6f2e19a 100644
--- a/readme.md
+++ b/readme.md
@@ -2,7 +2,7 @@
 
 Quickly browse through previous versions of a file.
 
-Usage: `gtm filename`
+Usage: `gtm FILENAME`
 
 Use the up/down arrow keys to browse through commits in the left pane, or to scroll the file in the right pane. Switch panes using the left/right arrow keys, or by clicking the mouse. You can also use h/j/k/l for navigation, and page up/down to scroll.