diff --git a/source/Irrlicht/CGLTFMeshFileLoader.cpp b/source/Irrlicht/CGLTFMeshFileLoader.cpp
index b9a0fc84..c82e8d79 100644
--- a/source/Irrlicht/CGLTFMeshFileLoader.cpp
+++ b/source/Irrlicht/CGLTFMeshFileLoader.cpp
@@ -208,7 +208,7 @@ core::vector2df CGLTFMeshFileLoader::ModelParser::readVec2DF(
 
 core::vector3df CGLTFMeshFileLoader::ModelParser::readVec3DF(
 		const BufferOffset& readFrom,
-		const float scale = 1.0f)
+		const float scale)
 {
 	return core::vector3df(
 		scale * readPrimitive<float>(readFrom),
diff --git a/source/Irrlicht/CGLTFMeshFileLoader.h b/source/Irrlicht/CGLTFMeshFileLoader.h
index d4c7061a..37590734 100644
--- a/source/Irrlicht/CGLTFMeshFileLoader.h
+++ b/source/Irrlicht/CGLTFMeshFileLoader.h
@@ -83,9 +83,13 @@ private:
 		static core::vector2df readVec2DF(
 				const BufferOffset& readFrom);
 
+		/* Read a vec3df from a buffer with transformations applied.
+		 *
+		 * Values are returned in Irrlicht coordinates.
+		 */
 		static core::vector3df readVec3DF(
 				const BufferOffset& readFrom,
-				const float scale);
+				const float scale = 1.0f);
 
 		void copyPositions(const Span<video::S3DVertex> vertices,
 				const std::size_t accessorId) const;
@@ -96,6 +100,10 @@ private:
 		void copyTCoords(const Span<video::S3DVertex> vertices,
 				const std::size_t accessorId) const;
 
+		/* Get the scale factor from the glTF mesh information.
+		 *
+		 * Returns 1.0f if no scale factor is present.
+		 */
 		float getScale() const;
 
 		std::size_t getElemCount(const std::size_t accessorIdx) const;