diff --git a/README.md b/README.md
index bf0a031..b512660 100644
--- a/README.md
+++ b/README.md
@@ -57,15 +57,22 @@ project's `.claude/settings.json`:
 {
   "extraKnownMarketplaces": {
     "pdat": {
-      "source": { "source": "url", "url": "https://git.pda.cz/PDAT/claude-plugins.git" }
+      "source": { "source": "git", "url": "https://git.pda.cz/PDAT/claude-plugins.git" }
     }
   },
   "enabledPlugins": { "pdat-swift-practice@pdat": true }
 }
 ```
 
-The git-based source types are `github`, `url` and `git-subdir`; there is
-no `git` type. For a self-hosted host, `url` is the one.
+Two different things are called a source, and they take different types:
+
+- **Marketplace source** — where the catalogue itself comes from. That is
+  the block above, and for a git repository the type is `git`. It is what
+  `/plugin marketplace add` writes into `known_marketplaces.json`.
+- **Plugin source** — where an individual plugin listed in
+  `marketplace.json` comes from: `github`, `url`, `git-subdir`, `npm`,
+  `archive` or `command`. Ours is a relative path into this repository, so
+  it needs none of them.
 
 Anyone who clones that project gets the skill without installing anything.