diff --git a/laserstudio/widgets/toolbars/zoomtoolbar.py b/laserstudio/widgets/toolbars/zoomtoolbar.py
index 3cec3d3..e94cfd5 100644
--- a/laserstudio/widgets/toolbars/zoomtoolbar.py
+++ b/laserstudio/widgets/toolbars/zoomtoolbar.py
@@ -16,9 +16,6 @@ def __init__(self, viewer: "Viewer"):
         self.setAllowedAreas(Qt.ToolBarArea.TopToolBarArea)
         self.setFloatable(True)
 
-        # Store a reference to the viewer.
-        self.viewer = viewer
-
         # Zoom in (*2).
         w = QPushButton(self)
         w.setToolTip("Zoom in")
diff --git a/laserstudio/widgets/viewer.py b/laserstudio/widgets/viewer.py
index 71a7989..f477c31 100644
--- a/laserstudio/widgets/viewer.py
+++ b/laserstudio/widgets/viewer.py
@@ -4,7 +4,7 @@
     QFileDialog,
     QGraphicsPixmapItem,
 )
-from PyQt6.QtCore import Qt, QPointF, pyqtSignal, pyqtProperty
+from PyQt6.QtCore import Qt, QPointF, pyqtSignal
 from PyQt6.QtGui import (
     QBrush,
     QColorConstants,
@@ -359,8 +359,7 @@ def mousePressEvent(self, event: Optional[QMouseEvent]):
 
         # The event is a press of the right button
         if event.button() == Qt.MouseButton.RightButton:
-            # Disable the stagesight following,
-            # through the toolbar' button (to update its state)
+            # Disable the StageSight tracking
             self.follow_stage_sight = False
 
             # Scroll gesture mode