diff --git a/include/SMaterial.h b/include/SMaterial.h
index 15a00482..d77727f7 100644
--- a/include/SMaterial.h
+++ b/include/SMaterial.h
@@ -473,7 +473,7 @@ namespace video
 
 		//! Is the zbuffer writable or is it read-only. Default: EZW_AUTO.
 		/** If this parameter is not EZW_OFF, you probably also want to set ZBuffer 
-		to values other than ECFN_DISABLED */
+		to values other than ECFN_DISABLED (which disables the zbuffer completely) */
 		E_ZWRITE ZWriteEnable:3;
 
 		//! Is backface culling enabled? Default: true
diff --git a/source/Irrlicht/CNullDriver.h b/source/Irrlicht/CNullDriver.h
index 1570ee5d..489a0ae1 100644
--- a/source/Irrlicht/CNullDriver.h
+++ b/source/Irrlicht/CNullDriver.h
@@ -747,6 +747,8 @@ namespace video
 			return (f32) getAverage ( p[(y * pitch) + x] );
 		}
 
+		// Check if z-writing should be enabled
+		// Note: If ZBuffer is disabled completely with ECFN_DISABLED it will still do nothing
 		inline bool getWriteZBuffer(const SMaterial& material) const
 		{
 			switch ( material.ZWriteEnable )