diff --git a/grum/mainwin.py b/grum/mainwin.py
index fdb23c9..24895c4 100644
--- a/grum/mainwin.py
+++ b/grum/mainwin.py
@@ -262,7 +262,7 @@ class MainWindow(QMainWindow):
         for i in items:
             i.timestamps.access.update()
             i.set_alarm(False)
-        items = (i for i in items if isinstance(i.value, PlotDescription)) #TODO
+        items = (i for i in items if isinstance(i.value, PlotDescription)) #TODO: for now, only overlay plots
         descs = {i.key: i.value for i in items}
         names = descs.keys()
         name = " | ".join(names)