diff --git a/pep-0633.rst b/pep-0633.rst
index 56c2a6181..583a41a2f 100644
--- a/pep-0633.rst
+++ b/pep-0633.rst
@@ -223,6 +223,200 @@ performed):
         reqs += optional_reqs
         return reqs, extras
 
+JSON schema
+-----------
+
+For initial validation, a JSON-schema can be used. Not only does this help
+tools have a consistent validation, but it allows code editors to highlight
+validation errors as users are building the dependencies list.
+
+.. code-block::
+
+    {
+        "$id": "http://sitesee.com.au/schemas/equipment/v3.json",
+        "$schema": "http://json-schema.org/draft-07/schema#",
+        "title": "Project metadata",
+        "type": "object",
+        "definitions": {
+            "requirementTable": {
+                "title": "Full project dependency specification",
+                "type": "object",
+                "properties": {
+                    "extras": {
+                        "title": "Dependency extras",
+                        "type": "array",
+                        "items": {
+                            "title": "Dependency extra",
+                            "type": "string"
+                        }
+                    },
+                    "markers": {
+                        "title": "Dependency environment markers",
+                        "type": "string"
+                    }
+                },
+                "oneOf": [
+                    {
+                        "title": "Version requirement",
+                        "properties": {
+                            "version": {
+                                "title": "Version",
+                                "type": "string"
+                            }
+                        }
+                    },
+                    {
+                        "title": "URL requirement",
+                        "properties": {
+                            "url": {
+                                "title": "URL",
+                                "type": "string",
+                                "format": "uri"
+                            }
+                        },
+                        "required": [
+                            "url"
+                        ]
+                    },
+                    {
+                        "title": "VCS requirement",
+                        "properties": {
+                            "revision": {
+                                "title": "VCS repository revision",
+                                "type": "string"
+                            }
+                        },
+                        "oneOf": [
+                            {
+                                "title": "Git repository",
+                                "properties": {
+                                    "git": {
+                                        "title": "Git URL",
+                                        "type": "string",
+                                        "format": "uri"
+                                    }
+                                },
+                                "required": [
+                                    "git"
+                                ]
+                            },
+                            {
+                                "title": "Mercurial repository",
+                                "properties": {
+                                    "hg": {
+                                        "title": "Mercurial URL",
+                                        "type": "string",
+                                        "format": "uri"
+                                    }
+                                },
+                                "required": [
+                                    "hg"
+                                ]
+                            },
+                            {
+                                "title": "Bazaar repository",
+                                "properties": {
+                                    "bzr": {
+                                        "title": "Bazaar URL",
+                                        "type": "string",
+                                        "format": "uri"
+                                    }
+                                },
+                                "required": [
+                                    "bzr"
+                                ]
+                            },
+                            {
+                                "title": "Subversion repository",
+                                "properties": {
+                                    "svn": {
+                                        "title": "Subversion URL",
+                                        "type": "string",
+                                        "format": "uri"
+                                    }
+                                },
+                                "required": [
+                                    "svn"
+                                ]
+                            }
+                        ]
+                    }
+                ]
+            },
+            "requirementVersion": {
+                "title": "Version project dependency specification",
+                "type": "string"
+            },
+            "requirement": {
+                "title": "Project dependency specification",
+                "oneOf": [
+                    {
+                        "$ref": "#/definitions/requirementVersion"
+                    },
+                    {
+                        "$ref": "#/definitions/requirementTable"
+                    },
+                    {
+                        "title": "Multiple specifications",
+                        "type": "array",
+                        "items": {
+                            "$ref": "#/definitions/requirementTable"
+                        },
+                        "minLength": 1
+                    }
+                ]
+            },
+            "optionalRequirement": {
+                "title": "Project optional dependency specification",
+                "allOf": [
+                    {
+                        "title": "Base requirement",
+                        "oneOf": [
+                            {
+                                "$ref": "#/definitions/requirementTable"
+                            },
+                            {
+                                "title": "Multiple specifications",
+                                "type": "array",
+                                "items": {
+                                    "$ref": "#/definitions/requirementTable"
+                                },
+                                "minLength": 1
+                            }
+                        ]
+                    },
+                    {
+                        "properties": {
+                            "for-extra": {
+                                "title": "Dependency's extra",
+                                "type": "string"
+                            }
+                        },
+                        "required": [
+                            "for-extra"
+                        ]
+                    }
+                ]
+            }
+        },
+        "properties": {
+            "dependencies": {
+                "title": "Project dependencies",
+                "type": "object",
+                "additionalProperties": {
+                    "$ref": "#/definitions/requirement"
+                }
+            },
+            "optional-dependencies": {
+                "title": "Project dependencies",
+                "type": "object",
+                "additionalProperties": {
+                    "$ref": "#/definitions/optionalRequirement"
+                }
+            }
+        }
+    }
+
 
 Examples
 ========