diff --git a/doc/05-repositories.md b/doc/05-repositories.md
index e79a7767f..94f91c3c2 100644
--- a/doc/05-repositories.md
+++ b/doc/05-repositories.md
@@ -100,7 +100,9 @@ It may include any of the other fields specified in the [schema](04-schema.md).
 #### notify
 
 The `notify` field allows you to specify an URL template for a URL that will
-be called every time a user installs a package.
+be called every time a user installs a package. The URL can be either an
+absolute path (that will use the same domain as the repository) or a fully
+qualified URL.
 
 An example value: