update readme

README.md

@@ -74,6 +74,14 @@ To get a commit report to a PDF file filtered by the `devel` branch:
 drillsergeant -o pdf -b devel
 ```
 
+To get a tally based on a directory:
+
+```bash
+drillsergeant -f /home/user/drillsergeant
+```
+
+This also works on enviroment variables too!
+
 Got too many contributors to fit onto your terminal? Run this by installing [bat](https://github.com/sharkdp/bat):
 
 ```bash
@@ -143,7 +151,7 @@ Then, you can find the binary in the `publish/` directory. You can move this exe
 
 ## Known Issues
 
-- A user must be in the root of a git project in order for this program to run.
+- A user must be in the root of a git project in order for this program to run (unless the user runs the `-f` flag when invoking `drillsergeant`).
 
 ## Next Steps/Contributing