diff --git a/src/openseadragon.js b/src/openseadragon.js
index c5f2ce5c..1fa8bb1c 100644
--- a/src/openseadragon.js
+++ b/src/openseadragon.js
@@ -2906,6 +2906,7 @@ function OpenSeadragon( options ){
 
     /**
      * Promise proxy in OpenSeadragon, enables $.supportsAsync feature.
+     * This proxy is also necessary because OperaMini does not implement Promises (checks fail).
      * @type {PromiseConstructor}
      */
     $.Promise = window["Promise"] && $.supportsAsync ? window["Promise"] : class {
diff --git a/src/tilesource.js b/src/tilesource.js
index a5442e0f..3073af0a 100644
--- a/src/tilesource.js
+++ b/src/tilesource.js
@@ -435,7 +435,7 @@ $.TileSource.prototype = {
     /**
      * Responsible for retrieving, and caching the
      * image metadata pertinent to this TileSources implementation.
-     * There are three scenarios of opening a tile source:
+     * There are three scenarios of opening a tile source: providing a parseable string, plain object, or an URL.
      * This method is only called by OSD if the TileSource configuration is a non-parseable string (~url).
      *
      * The string can contain a hash `#` symbol, followed by
@@ -727,8 +727,6 @@ $.TileSource.prototype = {
      * particularly if you want to use empty TiledImage with client-side derived data
      * only. The default tile-cache key is then called "" - an empty string.
      *
-     * todo AIOSA: provide another hash function that maps data onto tiles 1:1 (e.g sobel) or 1:m (vignetting)
-     *
      * Note: default behaviour does not take into account post data.
      * @param {Number} level tile level it was fetched with
      * @param {Number} x x-coordinate in the pyramid level
diff --git a/test/modules/ajax-tiles.js b/test/modules/ajax-tiles.js
index 78b4446d..0b1b21f0 100644
--- a/test/modules/ajax-tiles.js
+++ b/test/modules/ajax-tiles.js
@@ -50,13 +50,6 @@
                 ajaxHeaders: {
                     'X-Viewer-Header': 'ViewerHeaderValue'
                 },
-                // TODO: this test proves that tile cacheKey does not change
-                //  with headers change, which by default are part of the key,
-                //  but we cannot automatically update them since users might
-                //  manually change it long before... or can we? The tile gets
-                //  reloaded, so user code should get re-executed. IMHO,
-                //  with tile propagation the best would be throw away old tile
-                //  and start anew
                 callTileLoadedWithCachedData: true
             });
         },
diff --git a/test/modules/tilecache.js b/test/modules/tilecache.js
index d6c0a3da..3b2fddbb 100644
--- a/test/modules/tilecache.js
+++ b/test/modules/tilecache.js
@@ -350,9 +350,6 @@
             const workingc00 = tile00.getCache(tile00._wcKey);
             test.notEqual(workingc00, workingc12, "Underlying working cache is not shared despite tiles share hash key.");
 
-            //TODO fix test from here
-            test.ok("TODO: FIX TEST SUITE FOR NEW CACHE SYSTEM");
-
             // now set value with keeping origin
             await tile00.setData(42, T_D);
             const newCache = tile00.getCache(tile00._wcKey);