diff --git a/src/Parser/B3dmParser.js b/src/Parser/B3dmParser.js
index f1fb3900c3..00fc173f0f 100644
--- a/src/Parser/B3dmParser.js
+++ b/src/Parser/B3dmParser.js
@@ -46,7 +46,7 @@ function filterUnsupportedSemantics(obj) {
  * @param {THREE.Object3D} gltfScene - the parsed glTF scene
  * @param {String} gltfUpAxis - the gltfUpAxis parameter
  */
-function manageGltfRotation(gltfScene, gltfUpAxis) {
+function applyDeprecatedGltfUpAxis(gltfScene, gltfUpAxis) {
     if (gltfUpAxis === 'Z') {
         // If gltf up was already z-up, apply the inverse transform matrix that was applied in the glTFParser
         gltfScene.applyMatrix4(matrixChangeUpVectorYtoZInv);
@@ -178,7 +178,7 @@ export default {
                     scene.traverse(filterUnsupportedSemantics);
                 }
 
-                manageGltfRotation(gltf.scene, options.gltfUpAxis);
+                applyDeprecatedGltfUpAxis(gltf.scene, options.gltfUpAxis);
 
                 const shouldBePatchedForLogDepthSupport = Capabilities.isLogDepthBufferSupported() && !options.doNotPatchMaterial;
                 if (options.frustumCulling === false || options.overrideMaterials || shouldBePatchedForLogDepthSupport || options.layer) {
diff --git a/src/Provider/3dTilesProvider.js b/src/Provider/3dTilesProvider.js
index c54a7bbaab..adf011a66b 100644
--- a/src/Provider/3dTilesProvider.js
+++ b/src/Provider/3dTilesProvider.js
@@ -26,7 +26,7 @@ function b3dmToMesh(data, layer, url) {
 }
 
 function gltfToMesh(data, layer, url) {
-    const urlBase = THREE.LoaderUtils.extractUrlBase(url); // TODO verify that ? We already have it in layer.source.baseUrl?
+    const urlBase = THREE.LoaderUtils.extractUrlBase(url);
     return GLTFParser.parse(data, urlBase).then(result => ({ object3d: result.scene }));
 }
 
@@ -112,6 +112,8 @@ function executeCommand(command) {
                 if (magic[0] === '{') {
                     result = JSON.parse(utf8Decoder.decode(new Uint8Array(result)));
                     let newPrefix = '';
+                    // Another specifics of 3D tiles from Google: tilesets in tilesets are required from the root base
+                    // url and not from their parent base url
                     if (layer.source.isC3DTilesGoogleSource) {
                         newPrefix = layer.source.baseUrl;
                     } else {
diff --git a/src/Source/C3DTilesGoogleSource.js b/src/Source/C3DTilesGoogleSource.js
index 63fbec2c9c..8e37a068b1 100644
--- a/src/Source/C3DTilesGoogleSource.js
+++ b/src/Source/C3DTilesGoogleSource.js
@@ -64,11 +64,14 @@ class C3DTilesGoogleSource extends C3DTilesSource {
         });
     }
 
-    // TODO make it static?
+    /**
+     * Adds the key and session to the tile url (non-standard behaviour, that is specific to Google 3D tiles),
+     * see https://github.com/CesiumGS/3d-tiles/issues/746
+     * @param {String} url the tile url
+     * @returns {String} the tile url with Google map tiles api key and session parameters added at the end of the url
+     */
     getTileUrl(url) {
         const extraParameters = `key=${this.key}&session=${this.sessionId}`;
-        // special case to handle non-standard 3dTilesGoogle behavior
-        // see also https://github.com/CesiumGS/3d-tiles/issues/746
         return /\?/.test(url) ? `${url}&${extraParameters}` : `${url}?${extraParameters}`;
     }
 }