diff --git a/docs/authentication.rst b/docs/authentication.rst
index 5881143a..3dfd9f61 100644
--- a/docs/authentication.rst
+++ b/docs/authentication.rst
@@ -185,8 +185,14 @@ The ``/-/allow-debug`` tool lets you try out different  ``"action"`` blocks agai
 
 .. _authentication_permissions_metadata:
 
-Configuring permissions in metadata.json
-========================================
+Access permissions in metadata
+==============================
+
+There are two ways to configure permissions using ``metadata.json`` (or ``metadata.yaml``).
+
+For simple visibility permissions you can use ``"allow"`` blocks in the root, database, table and query sections.
+
+For other permissions you can use a ``"permissions"`` block, described :ref:`in the next section <blah>`.
 
 You can limit who is allowed to view different parts of your Datasette instance using ``"allow"`` keys in your :ref:`metadata` configuration.
 
@@ -201,8 +207,8 @@ If a user cannot access a specific database, they will not be able to access tab
 
 .. _authentication_permissions_instance:
 
-Controlling access to an instance
----------------------------------
+Access to an instance
+---------------------
 
 Here's how to restrict access to your entire Datasette instance to just the ``"id": "root"`` user:
 
@@ -228,8 +234,8 @@ One reason to do this is if you are using a Datasette plugin - such as `datasett
 
 .. _authentication_permissions_database:
 
-Controlling access to specific databases
-----------------------------------------
+Access to specific databases
+----------------------------
 
 To limit access to a specific ``private.db`` database to just authenticated users, use the ``"allow"`` block like this:
 
@@ -247,8 +253,8 @@ To limit access to a specific ``private.db`` database to just authenticated user
 
 .. _authentication_permissions_table:
 
-Controlling access to specific tables and views
------------------------------------------------
+Access to specific tables and views
+-----------------------------------
 
 To limit access to the ``users`` table in your ``bakery.db`` database:
 
@@ -277,8 +283,8 @@ This works for SQL views as well - you can list their names in the ``"tables"``
 
 .. _authentication_permissions_query:
 
-Controlling access to specific canned queries
----------------------------------------------
+Access to specific canned queries
+---------------------------------
 
 :ref:`canned_queries` allow you to configure named SQL queries in your ``metadata.json`` that can be executed by users. These queries can be set up to both read and write to the database, so controlling who can execute them can be important.
 
@@ -333,6 +339,63 @@ To limit this ability for just one specific database, use this:
         }
     }
 
+.. _authentication_permissions_other:
+
+Other permissions in metadata
+=============================
+
+For all other permissions, you can use one or more ``"permissions"`` blocks in your metadata.
+
+To grant access to the :ref:`permissions debug tool <PermissionsDebugView>` to all signed in users you can grant ``permissions-debug`` to any actor with an ``id`` matching the wildcard ``*`` by adding this a the root of your metadata:
+
+.. code-block:: json
+
+    {
+        "permissions": {
+            "debug-menu": {
+                "id": "*"
+            }
+        }
+    }
+
+To grant ``create-table`` to the user with ``id`` of ``editor`` for the ``docs`` database:
+
+.. code-block:: json
+
+    {
+        "databases": {
+            "docs": {
+                "permissions": {
+                    "create-table": {
+                        "id": "editor"
+                    }
+                }
+            }
+        }
+    }
+
+And for ``insert-row`` against the ``reports`` table in that ``docs`` database:
+
+.. code-block:: json
+
+    {
+        "databases": {
+            "docs": {
+                "tables": {
+                    "reports": {
+                        "permissions": {
+                            "insert-row": {
+                                "id": "editor"
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+The :ref:`PermissionsDebugView` can be useful for helping test permissions that you have configured in this way.
+
 .. _CreateTokenView:
 
 API Tokens
@@ -423,10 +486,12 @@ The currently authenticated actor is made available to plugins as ``request.acto
 The permissions debug tool
 ==========================
 
-The debug tool at ``/-/permissions`` is only available to the :ref:`authenticated root user <authentication_root>` (or any actor granted the ``permissions-debug`` action according to a plugin).
+The debug tool at ``/-/permissions`` is only available to the :ref:`authenticated root user <authentication_root>` (or any actor granted the ``permissions-debug`` action).
 
 It shows the thirty most recent permission checks that have been carried out by the Datasette instance.
 
+It also provides an interface for running hypothetical permission checks against a hypothetical actor. This is a useful way of confirming that your configured permissions work in the way you expect.
+
 This is designed to help administrators and plugin authors understand exactly how permission checks are being carried out, in order to effectively configure Datasette's permission system.
 
 .. _authentication_ds_actor: