diff --git a/README.md b/README.md
index c7a0459f..00b806a1 100644
--- a/README.md
+++ b/README.md
@@ -30,11 +30,13 @@ which define the currently displayed map viewport.
 
 ---
 
-The **TileImageLoader** class uses an implementation of
+The **TileImageLoader** class uses
 [IDistributedCache](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.caching.distributed.idistributedcache?view=dotnet-plat-ext-8.0)
-for optional caching of map tile bitmaps.
+for optional caching of map tile bitmaps. By default, the cache is a
+[MemoryDistributedCache](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.caching.distributed.memorydistributedcache?view=dotnet-plat-ext-8.0).
+instance with all default options.
 
-Map Control comes with three such implementations:
+Map Control provides three IDistributedCache implementations for persistent caching:
 * ImageFileCache, an IDistributedCache implementation that stores each cached map tile as a single image file,
 in the original file format delivered by the map provider (typically PNG or JPG). ImageFileCache is part of
 the MapControl library.