diff --git a/catfish/utils/processes.py b/catfish/utils/processes.py
index da9ef10..6822dc4 100644
--- a/catfish/utils/processes.py
+++ b/catfish/utils/processes.py
@@ -4,6 +4,7 @@ import psutil
 
 
 def terminate_processes(procs: List[psutil.Process], timeout=3):
+    # https://psutil.readthedocs.io/en/latest/#terminate-my-children
     for p in procs:
         p.terminate()
     gone, alive = psutil.wait_procs(procs, timeout=timeout)