diff --git a/saqc/flagger/backtrack.py b/saqc/flagger/backtrack.py
index 4e36299e6452034f9819eacc8be8f1971faca4e7..eeedabf9b2e27d72bb087f88ca90074665932c92 100644
--- a/saqc/flagger/backtrack.py
+++ b/saqc/flagger/backtrack.py
@@ -212,8 +212,8 @@ class Backtrack:
         else:
             # calc the squeezed series.
             # we dont have to care about any forced series
-            # because anytime force is given, the False's in
-            # the mask are propagated back over the whole BT
+            # because anytime force was given, the False's in
+            # the mask were propagated back over the whole BT
             mask = self.mask.iloc[:, -n:]
             bt = self.bt.iloc[: -n:]
             s = bt[mask].max(axis=1)