diff --git a/README.md b/README.md
index fddd4c0..f230f34 100644
--- a/README.md
+++ b/README.md
@@ -10,16 +10,16 @@ See original version [here](https://github.com/daniel-beck/tkdu/commit/55ef0278c
 
 ```
 Usage:
-  tkdu.py <file.gz>     interpret file as gzipped du -ak output and visualize it
-  tkdu.py <file>        interpret file as du -ak output and visualize it
+  tkdu.py <file.gz>     interpret file as gzipped `du -ak` output and visualize it
+  tkdu.py <file>        interpret file as `du -ak > <file>` output and visualize it
   tkdu.py <folder>      analyze disk usage in that folder
   tkdu.py -             interpret stdin input as du -ak output and visualize it
-  tkdu.py               ask for folder to analyze
+  tkdu.py               ask for folder to analyze (only works for folders!)
 
 Controls:
   * Press `q` to quit
-  * LMB: zoom in to item
-  * RMB: zoom out one level
+  * left mouse buton: zoom in to item
+  * right mouse button: zoom out one level
   * Press `1`..`9`: Show that many nested levels
   * Press `0`: Show man nested levels
 ```