diff --git a/Source/Bind/Specifications/Glu/glu.spec b/Source/Bind/Specifications/Glu/glu.spec
index 55a4de47..09ba1952 100644
--- a/Source/Bind/Specifications/Glu/glu.spec
+++ b/Source/Bind/Specifications/Glu/glu.spec
@@ -221,6 +221,7 @@ NextContour(tess, type)
 	param		tess		TesselatorObj in value
 	param		type		TessContour in value
 
+# Edited for OpenTK
 NurbsCallback(nurb, which, CallBackFunc)
 	return		void
 	param		nurb		NurbsObj in value
@@ -319,6 +320,7 @@ PwlCurve(nurb, count, data, stride, type)
 	param		stride		Int32 in value
 	param		type		NurbsTrim in value
 
+# Edited for OpenTK
 QuadricCallback(quad, which, CallBackFunc)
 	return		void
 	param		quad		QuadricObj in value
@@ -374,6 +376,7 @@ TessBeginPolygon(tess, data)
 	param		tess		TesselatorObj in value
 	param		data		VoidPointer in value
 
+# Edited for OpenTK -- safety reasons
 TessCallback(tess, which, CallBackFunc)
 	return		void
 	param		tess		TesselatorObj in value
@@ -401,10 +404,11 @@ TessProperty(tess, which, data)
 	param		which		TessProperty in value
 	param		data		Float64 in value
 
+# Edited for OpenTK
 TessVertex(tess, location, data)
 	return		void
 	param		tess		TesselatorObj in value
-	param		location	Float64 out array [3]
+	param		location	Float64 in array [3] # Float64 out array [3]
 	param		data		VoidPointer in value
 
 # Edited for OpenTK