Add another TODO

README.md

@@ -272,6 +272,9 @@ The script `test-case-capture.py` can be used to record sound generated by the
 board sound cards during the test (i.e. with many instances of
 `pw-jack sndfile-jackplay`) to evaluate how the sound is affected.
 
+**TODO**:
+- Generate a graph from required_time.
+
 # Test case 5: xrun behaviour under load
 
 In this test the same setup as Test case 1 will be used. To test the xrun