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+++ b/docs/dev.md
@@ -21,3 +21,26 @@ This document contains notes and guidelines for Pleroma developers.
 ## Auth-related configuration, OAuth consumer mode etc.
 
 See `Authentication` section of [the configuration cheatsheet](configuration/cheatsheet.md#authentication).
+
+## MRF policies descriptions
+
+If MRF policy depends on config, it can be added into MRF tab to adminFE by adding `config_description/0` method, which returns map with special structure.
+
+Example:
+
+```elixir
+%{
+      key: :mrf_activity_expiration,
+      related_policy: "Pleroma.Web.ActivityPub.MRF.ActivityExpirationPolicy",
+      label: "MRF Activity Expiration Policy",
+      description: "Adds automatic expiration to all local activities",
+      children: [
+        %{
+          key: :days,
+          type: :integer,
+          description: "Default global expiration time for all local activities (in days)",
+          suggestions: [90, 365]
+        }
+      ]
+    }
+```