diff --git a/pyzebra/app/panel_hdf_param_study.py b/pyzebra/app/panel_hdf_param_study.py
index 1fcf567..bd59b4d 100644
--- a/pyzebra/app/panel_hdf_param_study.py
+++ b/pyzebra/app/panel_hdf_param_study.py
@@ -364,7 +364,7 @@ def create():
         _update_proj_plots()
 
     proj_auto_checkbox = CheckboxGroup(
-        labels=["Projections Intensity Range"], active=[0], width=145, margin=[10, 5, 0, 5]
+        labels=["Projections Intensity Range:"], active=[0], width=145, margin=[10, 5, 0, 5]
     )
     proj_auto_checkbox.on_change("active", proj_auto_checkbox_callback)
 
diff --git a/pyzebra/app/panel_hdf_viewer.py b/pyzebra/app/panel_hdf_viewer.py
index cc6381e..e27deaa 100644
--- a/pyzebra/app/panel_hdf_viewer.py
+++ b/pyzebra/app/panel_hdf_viewer.py
@@ -689,7 +689,7 @@ def create():
         _update_image()
 
     main_auto_checkbox = CheckboxGroup(
-        labels=["Frame Intensity Range"], active=[0], width=145, margin=[10, 5, 0, 5]
+        labels=["Frame Intensity Range:"], active=[0], width=145, margin=[10, 5, 0, 5]
     )
     main_auto_checkbox.on_change("active", main_auto_checkbox_callback)
 
@@ -721,7 +721,7 @@ def create():
         _update_proj_plots()
 
     proj_auto_checkbox = CheckboxGroup(
-        labels=["Projections Intensity Range"], active=[0], width=145, margin=[10, 5, 0, 5]
+        labels=["Projections Intensity Range:"], active=[0], width=145, margin=[10, 5, 0, 5]
     )
     proj_auto_checkbox.on_change("active", proj_auto_checkbox_callback)