diff --git a/python/GafferSceneUI/VisualiserToolUI.py b/python/GafferSceneUI/VisualiserToolUI.py
index df227ad50f..6552707c0e 100644
--- a/python/GafferSceneUI/VisualiserToolUI.py
+++ b/python/GafferSceneUI/VisualiserToolUI.py
@@ -65,6 +65,17 @@
 			"toolbarLayout:section", "Bottom",
 			"toolbarLayout:width", 150,
 
+		],
+		"opacity" : [
+
+			"description",
+			"""
+			The amount the visualiser will occlude the scene locations being visualised.
+			""",
+
+			"toolbarLayout:section", "Bottom",
+			"toolbarLayout:width", 100,
+
 		],
 		"valueMin" : [