diff --git a/keyring/backends/libsecret.py b/keyring/backends/libsecret.py
index 39ad9a25..368b0d31 100644
--- a/keyring/backends/libsecret.py
+++ b/keyring/backends/libsecret.py
@@ -34,6 +34,13 @@ class Keyring(backend.SchemeSelectable, KeyringBackend):
 
     @property
     def schema(self):
+        """
+        Schema is used by the API to define the types of each field.
+
+        >>> available or __import__('pytest').skip()
+        >>> Keyring().schema.attributes
+        {'username': 0, 'password': 0, 'application': 0}
+        """
         return Secret.Schema.new(
             "org.freedesktop.Secret.Generic",
             Secret.SchemaFlags.NONE,