diff --git a/schemas/README.schema b/schemas/README.schema
new file mode 100644
index 0000000..36e44f6
--- /dev/null
+++ b/schemas/README.schema
@@ -0,0 +1,71 @@
+Entity manager configuration file schema
+----------------------------------------
+
+Entity manager configuration files are JSON documents and can be validated with
+a JSON schema[1].  This document provides an overview of the general structure
+of an entity manager configuration file.
+
+An entity manager configuration file consists of one or more entity manager
+configurations.  This provides flexibility for system designers - the
+configuration data for an entire platform or set of platforms can be expressed
+in a single file, or can be organized into several smaller files.  Thus, the
+top most schema describes a single object or an array of objects.
+
+A single entity manager configuration
+----------------------------------------
+At its core entity manager simply exports objects onto DBus when a specific
+event occurs.  As such, an entity manager configuration provides a syntax for
+describing the dbus interfaces to export, the object paths on which to add the
+interfaces and the event that should trigger the export.  This is accomplished
+with four properties.
+
+Type
+----------------------------------------
+The type property identifies the type of the configuration.  When exported,
+configuration data will be instantiated as grandchildren of
+/xyz/openbmc_project/inventory/system/<Type>.  For a comprehensive list of
+supported types, consult the schema (global.json).
+
+Name
+----------------------------------------
+The name property identifies the name of the configuration.  When exported,
+configuration data will be instantiated as children of
+/xyz/openbmc_project/inventory/system/<Type>/<Name>.  Additionally, any DBus
+interfaces listed in openbmc-dbus.json will be added on
+/xyz/openbmc_project/inventory/system/<Type>/<Name>.
+
+Probe
+----------------------------------------
+The probe property describes the event which will cause entity manager to
+export the configuration to DBus, making it available to other applications.
+
+Exposes
+----------------------------------------
+The exposes property describes the configuration data at its most specific
+level.  The exposes property is an array of heterogeneous configuration data.
+Each exposes element has its own schema which is outlined by the subschemas in
+the schemas directory.  Each schema must require a type and name (not to be
+confused with the Type and Name properties of the parent JSON object) property
+since entity manager will construct the Dbus interface name and object path
+based on those properties:
+
+/xyz/openbmc_project/inventory/system/Board/RiserCard1/<Name>:
+   xyz.openbmc_project.Configuration.<Type>:
+     <remaining properties defined by exposes subschema>
+
+Adding new exposes property subschema
+----------------------------------------
+New subschema for the exposes property must be added to the schema directory,
+and then referenced from global.json at /definitions/EMExposesElement.  Exposes
+element subschema must require a type and name property (the validator will
+fail otherwise) and should explicitly enumerate all properties and use
+additionalProperties so mistakes can be found
+during validation.
+
+Adding new Dbus interfaces
+----------------------------------------
+To export new interfaces on the configuration parent object e.g.:
+/xyz/openbmc_project/inventory/system/Board/RiserCard1 add additional subschema
+to openbmc-dbus.json.
+
+[1] https://json-schema.org/
diff --git a/schemas/global.json b/schemas/global.json
index 911c692..eb1af51 100644
--- a/schemas/global.json
+++ b/schemas/global.json
@@ -1,6 +1,43 @@
 {
     "$schema": "http://json-schema.org/draft-07/schema#",
     "definitions": {
+        "EMExposesElement": {
+            "description": [
+                "The exposes property element schema.  An element of the exposes ",
+                "property is always an array where elements are of type exposes ",
+                "entry."
+            ],
+            "oneOf": [
+                {
+                    "$ref": "legacy.json#/definitions/Aggregate"
+                },
+                {
+                    "description": [
+                        "Ensure the parent oneOf schema does not validate ",
+                        "when an element does not define a type property."
+                    ],
+                    "not": {
+                        "required": [
+                            "Type"
+                        ]
+                    },
+                    "title": "Missing Type"
+                },
+                {
+                    "description": [
+                        "Ensure the parent oneOf schema does not validate ",
+                        "when an element does not define a name property."
+                    ],
+                    "not": {
+                        "required": [
+                            "Name"
+                        ]
+                    },
+                    "title": "Missing Name"
+                }
+            ],
+            "title": "Exposes Property Element"
+        },
         "EMConfig": {
             "title": "Entity Manager Configuration",
             "description": [
@@ -26,7 +63,7 @@
                     ],
                     "type": "array",
                     "items": {
-                        "$ref": "legacy.json#/definitions/Aggregate"
+                        "$ref": "#/definitions/EMExposesElement"
                     }
                 },
                 "Logging": {
diff --git a/schemas/legacy.json b/schemas/legacy.json
index f3204be..69d7a19 100644
--- a/schemas/legacy.json
+++ b/schemas/legacy.json
@@ -2,6 +2,11 @@
     "$schema": "http://json-schema.org/draft-07/schema#",
     "definitions": {
         "Aggregate": {
+            "description": [
+                "Don't add additional properties to this schema.  Consult ",
+                "README.schema for instructions on adding new Exposes element ",
+                "sub-schema."
+            ],
             "additionalProperties": false,
             "properties": {
                 "Address": {