diff --git a/lib/webgl.js b/lib/webgl.js
index b264f1f..7caca17 100644
--- a/lib/webgl.js
+++ b/lib/webgl.js
@@ -129,6 +129,14 @@
 	const parameterFakeTypes = {
 		preference: function(originalValue, definition, window, prefs){
 			const settingValue = prefs(definition.preferenceName) || originalValue;
+			switch (settingValue){
+				case "{undefined}":
+					return undefined;
+				case "{false}":
+					return false;
+				case "{empty}":
+					return "";
+			}
 			return settingValue;
 		},
 		decimal: function(originalValue, definition, window){
diff --git a/releaseNotes.txt b/releaseNotes.txt
index fdf5de7..e70b92e 100644
--- a/releaseNotes.txt
+++ b/releaseNotes.txt
@@ -3,7 +3,7 @@ Version 1.5:
 		- 
 	
 	new features:
-		- 
+		- added {empty}, {false} and {undefined} to webGL preference parameters (i.e. VENDOR, RENDERER, UNMASKED_VENDOR_WEBGL and UNMASKED_RENDERER_WEBGL)
 	
 	fixes:
 		-