diff --git a/etc/api/angular_devkit/core/src/_golden-api.d.ts b/etc/api/angular_devkit/core/src/_golden-api.d.ts
index 30c55cd002..c0010196a4 100644
--- a/etc/api/angular_devkit/core/src/_golden-api.d.ts
+++ b/etc/api/angular_devkit/core/src/_golden-api.d.ts
@@ -226,6 +226,7 @@ export declare class CoreSchemaRegistry implements SchemaRegistry {
     flatten(schema: JsonObject): Observable<JsonObject>;
     registerUriHandler(handler: UriHandler): void;
     usePromptProvider(provider: PromptProvider): void;
+    useXDeprecatedProvider(onUsage: (message: string) => void): void;
 }
 
 export declare function createWorkspaceHost(host: virtualFs.Host): WorkspaceHost;
@@ -904,6 +905,7 @@ export interface SchemaRegistry {
     compile(schema: Object): Observable<SchemaValidator>;
     flatten(schema: JsonObject | string): Observable<JsonObject>;
     usePromptProvider(provider: PromptProvider): void;
+    useXDeprecatedProvider(onUsage: (message: string) => void): void;
 }
 
 export declare class SchemaValidationException extends BaseException {
diff --git a/packages/angular_devkit/core/src/json/schema/interface.ts b/packages/angular_devkit/core/src/json/schema/interface.ts
index 59e0530714..610e8d013d 100644
--- a/packages/angular_devkit/core/src/json/schema/interface.ts
+++ b/packages/angular_devkit/core/src/json/schema/interface.ts
@@ -117,6 +117,7 @@ export interface SchemaRegistry {
   addFormat(format: SchemaFormat): void;
   addSmartDefaultProvider<T>(source: string, provider: SmartDefaultProvider<T>): void;
   usePromptProvider(provider: PromptProvider): void;
+  useXDeprecatedProvider(onUsage: (message: string) => void): void;
 
   /**
    * Add a transformation step before the validation of any Json.
diff --git a/packages/angular_devkit/core/src/json/schema/registry.ts b/packages/angular_devkit/core/src/json/schema/registry.ts
index cb98ffade8..49529c98e8 100644
--- a/packages/angular_devkit/core/src/json/schema/registry.ts
+++ b/packages/angular_devkit/core/src/json/schema/registry.ts
@@ -461,9 +461,7 @@ export class CoreSchemaRegistry implements SchemaRegistry {
     this._ajv.addFormat(format.name, {
       async: format.formatter.async,
       validate,
-    // AJV typings list `compare` as required, but it is optional.
-    // tslint:disable-next-line:no-any
-    } as any);
+    });
   }
 
   addSmartDefaultProvider<T>(source: string, provider: SmartDefaultProvider<T>) {
@@ -755,4 +753,17 @@ export class CoreSchemaRegistry implements SchemaRegistry {
       }),
     );
   }
+
+  useXDeprecatedProvider(onUsage: (message: string) => void): void {
+    this._ajv.addKeyword('x-deprecated', {
+      validate: (schema, _data, _parentSchema, _dataPath, _parentDataObject, propertyName) => {
+        if (schema) {
+          onUsage(`Option "${propertyName}" is deprecated${typeof schema == 'string' ? ': ' + schema : '.'}`);
+        }
+
+        return true;
+      },
+      errors: false,
+    });
+  }
 }
diff --git a/packages/angular_devkit/core/src/json/schema/registry_spec.ts b/packages/angular_devkit/core/src/json/schema/registry_spec.ts
index bcc902c53d..2a770bf438 100644
--- a/packages/angular_devkit/core/src/json/schema/registry_spec.ts
+++ b/packages/angular_devkit/core/src/json/schema/registry_spec.ts
@@ -481,4 +481,35 @@ describe('CoreSchemaRegistry', () => {
       .toPromise().then(done, done.fail);
   });
 
+  it('adds deprecated options usage', done => {
+    const registry = new CoreSchemaRegistry();
+    const deprecatedMessages: string[] = [];
+    registry.useXDeprecatedProvider(m => deprecatedMessages.push(m));
+
+    const data = {
+      foo: true,
+      bar: true,
+      bat: true,
+    };
+
+    registry
+      .compile({
+        properties: {
+          foo: { type: 'boolean', 'x-deprecated': 'Use bar instead.' },
+          bar: { type: 'boolean', 'x-deprecated': true },
+          buz: { type: 'boolean', 'x-deprecated': true },
+          bat: { type: 'boolean', 'x-deprecated': false },
+        },
+      })
+      .pipe(
+        mergeMap(validator => validator(data)),
+        map(result => {
+          expect(deprecatedMessages.length).toBe(2);
+          expect(deprecatedMessages[0]).toBe('Option "foo" is deprecated: Use bar instead.');
+          expect(deprecatedMessages[1]).toBe('Option "bar" is deprecated.');
+          expect(result.success).toBe(true, result.errors);
+        }),
+      )
+      .toPromise().then(done, done.fail);
+});
 });
diff --git a/packages/angular_devkit/schematics_cli/bin/schematics.ts b/packages/angular_devkit/schematics_cli/bin/schematics.ts
index e416303e04..51f0e52564 100644
--- a/packages/angular_devkit/schematics_cli/bin/schematics.ts
+++ b/packages/angular_devkit/schematics_cli/bin/schematics.ts
@@ -259,6 +259,10 @@ export async function main({
     parsedArgs[key] = argv2[key];
   }
 
+
+  // Show usage of deprecated options
+  workflow.registry.useXDeprecatedProvider(msg => logger.warn(msg));
+
   // Pass the rest of the arguments as the smart default "argv". Then delete it.
   workflow.registry.addSmartDefaultProvider('argv', (schema: JsonObject) => {
     if ('index' in schema) {