diff --git a/debug-viewer/GstDebugViewer/GUI.py b/debug-viewer/GstDebugViewer/GUI.py
index f119559a78..fb15df73b4 100644
--- a/debug-viewer/GstDebugViewer/GUI.py
+++ b/debug-viewer/GstDebugViewer/GUI.py
@@ -568,6 +568,7 @@ class FilteredLogModel (FilteredLogModelBase):
         range_model = self.super_model
         super_start, super_end = range_model.line_index_range
 
+        # FIXME: This is too simple!
         start_index = self.line_index_from_super (super_start)
         end_index = self.line_index_from_super (super_end)