diff --git a/README.md b/README.md
index f3dcbbb..baa1a1e 100644
--- a/README.md
+++ b/README.md
@@ -29,3 +29,11 @@ And now you can interact with the resulting timelog DataFrame:
 ```python
 timelog.query("time>30").loc[:100,["description","time","orig_desc"]].tail(50)
 ```
+
+Or the slightly more processed tl DataFrame, for example to get the hours worked per project:
+
+```python
+tl.groupby("project").agg({"time": "sum"})["time"]/60
+```
+
+And yeah you can just sort of tack on the column you want to mess with and do an operation like that!