diff --git a/follow.py b/follow.py
index 107986d44..7f88b8ebd 100644
--- a/follow.py
+++ b/follow.py
@@ -31,7 +31,9 @@ from session import postJson
 
 
 def createInitialLastSeen(baseDir: str, httpPrefix: str) -> None:
-    """Creates initial lastseen files for all follows
+    """Creates initial lastseen files for all follows.
+    The lastseen files are used to generate the Zzz icons on
+    follows/following lists on the profile screen.
     """
     for subdir, dirs, files in os.walk(baseDir + '/accounts'):
         for acct in dirs: