diff --git a/data/presets/README.md b/data/presets/README.md
index 698b7af37..8a4267be8 100644
--- a/data/presets/README.md
+++ b/data/presets/README.md
@@ -32,7 +32,9 @@ A basic preset is of the form:
         "village green",
         "woodland"
     ],
-    // tags that automatically added to the feature when it's selected
+    // tags that are added to the feature when selecting the preset,
+    // and also used to match the preset against existing features.
+    // You can use the value "*" to match any value.
     "tags": {
         "leisure": "park"
     },