diff --git a/src/vs/platform/configuration/common/configuration.ts b/src/vs/platform/configuration/common/configuration.ts
index 06a98c7918f..2937bca8f1f 100644
--- a/src/vs/platform/configuration/common/configuration.ts
+++ b/src/vs/platform/configuration/common/configuration.ts
@@ -83,6 +83,8 @@ export interface IConfigurationValue<T> {
 	readonly workspace?: { value?: T, override?: T };
 	readonly workspaceFolder?: { value?: T, override?: T };
 	readonly memory?: { value?: T, override?: T };
+
+	readonly overrideIdentifiers?: string[];
 }
 
 export interface IConfigurationService {
diff --git a/src/vs/platform/configuration/common/configurationModels.ts b/src/vs/platform/configuration/common/configurationModels.ts
index 759376b9862..ee715c1631f 100644
--- a/src/vs/platform/configuration/common/configurationModels.ts
+++ b/src/vs/platform/configuration/common/configurationModels.ts
@@ -391,6 +391,7 @@ export class Configuration {
 		const workspaceFolderValue = folderConfigurationModel ? overrides.overrideIdentifier ? folderConfigurationModel.freeze().override(overrides.overrideIdentifier).getValue<C>(key) : folderConfigurationModel.freeze().getValue<C>(key) : undefined;
 		const memoryValue = overrides.overrideIdentifier ? memoryConfigurationModel.override(overrides.overrideIdentifier).getValue<C>(key) : memoryConfigurationModel.getValue<C>(key);
 		const value = consolidateConfigurationModel.getValue<C>(key);
+		const overrideIdentifiers: string[] = arrays.distinct(arrays.flatten(consolidateConfigurationModel.overrides.map(override => override.identifiers))).filter(overrideIdentifier => consolidateConfigurationModel.getOverrideValue(key, overrideIdentifier) !== undefined);
 
 		return {
 			defaultValue: defaultValue,
@@ -409,6 +410,8 @@ export class Configuration {
 			workspace: workspaceValue !== undefined ? { value: this._workspaceConfiguration.freeze().getValue(key), override: overrides.overrideIdentifier ? this._workspaceConfiguration.freeze().getOverrideValue(key, overrides.overrideIdentifier) : undefined } : undefined,
 			workspaceFolder: workspaceFolderValue !== undefined ? { value: folderConfigurationModel?.freeze().getValue(key), override: overrides.overrideIdentifier ? folderConfigurationModel?.freeze().getOverrideValue(key, overrides.overrideIdentifier) : undefined } : undefined,
 			memory: memoryValue !== undefined ? { value: memoryConfigurationModel.getValue(key), override: overrides.overrideIdentifier ? memoryConfigurationModel.getOverrideValue(key, overrides.overrideIdentifier) : undefined } : undefined,
+
+			overrideIdentifiers: overrideIdentifiers.length ? overrideIdentifiers : undefined
 		};
 	}
 
diff --git a/src/vs/platform/configuration/test/common/configurationModels.test.ts b/src/vs/platform/configuration/test/common/configurationModels.test.ts
index daf54b4b9f5..1ff040dce84 100644
--- a/src/vs/platform/configuration/test/common/configurationModels.test.ts
+++ b/src/vs/platform/configuration/test/common/configurationModels.test.ts
@@ -361,6 +361,17 @@ suite('CustomConfigurationModel', () => {
 
 suite('Configuration', () => {
 
+	test('Test inspect for overrideIdentifiers', () => {
+		const defaultConfigurationModel = parseConfigurationModel({ '[l1]': { 'a': 1 }, '[l2]': { 'b': 1 } });
+		const userConfigurationModel = parseConfigurationModel({ '[l3]': { 'a': 2 } });
+		const workspaceConfigurationModel = parseConfigurationModel({ '[l1]': { 'a': 3 }, '[l4]': { 'a': 3 } });
+		const testObject: Configuration = new Configuration(defaultConfigurationModel, userConfigurationModel, new ConfigurationModel(), workspaceConfigurationModel);
+
+		const { overrideIdentifiers } = testObject.inspect('a', {}, undefined);
+
+		assert.deepEqual(overrideIdentifiers, ['l1', 'l3', 'l4']);
+	});
+
 	test('Test update value', () => {
 		const parser = new ConfigurationModelParser('test');
 		parser.parseContent(JSON.stringify({ 'a': 1 }));
@@ -468,7 +479,7 @@ suite('Configuration', () => {
 
 	});
 
-	test('Test compare and deletre workspace folder configuration', () => {
+	test('Test compare and delete workspace folder configuration', () => {
 		const testObject = new Configuration(new ConfigurationModel(), new ConfigurationModel());
 		testObject.updateFolderConfiguration(URI.file('file1'), toConfigurationModel({
 			'editor.lineNumbers': 'off',
@@ -484,6 +495,12 @@ suite('Configuration', () => {
 
 	});
 
+	function parseConfigurationModel(content: any): ConfigurationModel {
+		const parser = new ConfigurationModelParser('test');
+		parser.parseContent(JSON.stringify(content));
+		return parser.configurationModel;
+	}
+
 });
 
 suite('ConfigurationChangeEvent', () => {
diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index 4db9195fd09..15d667e14fc 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -1431,6 +1431,8 @@ declare module 'vscode' {
 			workspaceLanguageValue?: T;
 			workspaceFolderLanguageValue?: T;
 
+			languages?: string[];
+
 		} | undefined;
 
 		/**
diff --git a/src/vs/workbench/api/common/extHostConfiguration.ts b/src/vs/workbench/api/common/extHostConfiguration.ts
index aeabbaed7c1..ad9446b7394 100644
--- a/src/vs/workbench/api/common/extHostConfiguration.ts
+++ b/src/vs/workbench/api/common/extHostConfiguration.ts
@@ -45,6 +45,8 @@ type ConfigurationInspect<T> = {
 	userLanguageValue?: T;
 	workspaceLanguageValue?: T;
 	workspaceFolderLanguageValue?: T;
+
+	languages?: string[];
 };
 
 function isUri(thing: any): thing is vscode.Uri {
@@ -264,6 +266,8 @@ export class ExtHostConfigProvider {
 						userLanguageValue: config.user?.override,
 						workspaceLanguageValue: config.workspace?.override,
 						workspaceFolderLanguageValue: config.workspaceFolder?.override,
+
+						languages: config.overrideIdentifiers
 					};
 				}
 				return undefined;