diff --git a/src/vs/editor/common/config/commonEditorConfig.ts b/src/vs/editor/common/config/commonEditorConfig.ts
index 3bde5dfd839a3c960b6431812739c09c3fd00199..f9bf0b49449a3b722896cb34476fb5b312f670ee 100644
--- a/src/vs/editor/common/config/commonEditorConfig.ts
+++ b/src/vs/editor/common/config/commonEditorConfig.ts
@@ -502,6 +502,11 @@ const editorConfiguration: IConfigurationNode = {
 			default: true,
 			description: nls.localize('wordBasedSuggestions', "Controls whether completions should be computed based on words in the document.")
 		},
+		'editor.wordBasedSuggestionsOnlySameLanguage': {
+			type: 'boolean',
+			default: true,
+			description: nls.localize('wordBasedSuggestionsOnlySameLanguage', "Controls whether word based completions should be included from opened documents of the same language or any language.")
+		},
 		'editor.semanticHighlighting.enabled': {
 			enum: [true, false, 'configuredByTheme'],
 			enumDescriptions: [
diff --git a/src/vs/editor/common/services/editorWorkerServiceImpl.ts b/src/vs/editor/common/services/editorWorkerServiceImpl.ts
index 55171bef77d1dcbd6292e474161e4db49cd12c82..72508f18d199517cf2bba0251b220a2e0c0575bf 100644
--- a/src/vs/editor/common/services/editorWorkerServiceImpl.ts
+++ b/src/vs/editor/common/services/editorWorkerServiceImpl.ts
@@ -148,7 +148,7 @@ class WordBasedCompletionItemProvider implements modes.CompletionItemProvider {
 	}
 
 	async provideCompletionItems(model: ITextModel, position: Position): Promise<modes.CompletionList | undefined> {
-		const { wordBasedSuggestions } = this._configurationService.getValue<{ wordBasedSuggestions?: boolean }>(model.uri, position, 'editor');
+		const { wordBasedSuggestions, wordBasedSuggestionsOnlySameLanguage } = this._configurationService.getValue<{ wordBasedSuggestions?: boolean, wordBasedSuggestionsOnlySameLanguage?: boolean }>(model.uri, position, 'editor');
 		if (!wordBasedSuggestions) {
 			return undefined;
 		}
@@ -160,6 +160,8 @@ class WordBasedCompletionItemProvider implements modes.CompletionItemProvider {
 			}
 			if (candidate === model) {
 				models.unshift(candidate.uri);
+			} else if (!wordBasedSuggestionsOnlySameLanguage) {
+				models.push(candidate.uri);
 			} else if (candidate.getLanguageIdentifier().id === model.getLanguageIdentifier().id) {
 				models.push(candidate.uri);
 			}
diff --git a/src/vs/editor/standalone/browser/standaloneCodeEditor.ts b/src/vs/editor/standalone/browser/standaloneCodeEditor.ts
index e06bd35a8d0e7909a58904f254e6405357be9f15..9344ee801c6a40b985a7909d115375b06b3bf3ed 100644
--- a/src/vs/editor/standalone/browser/standaloneCodeEditor.ts
+++ b/src/vs/editor/standalone/browser/standaloneCodeEditor.ts
@@ -113,6 +113,10 @@ export interface IGlobalEditorOptions {
 	 * Defaults to true.
 	 */
 	wordBasedSuggestions?: boolean;
+	/**
+	 * Controls whether word based completions should be included from opened documents of the same language or any language.
+	 */
+	wordBasedSuggestionsOnlySameLanguage?: boolean;
 	/**
 	 * Controls whether the semanticHighlighting is shown for the languages that support it.
 	 * true: semanticHighlighting is enabled for all themes
diff --git a/src/vs/monaco.d.ts b/src/vs/monaco.d.ts
index f8ce89f9be1700a3fddd049c3f8e603a9cfe6cab..406fe98a2ebc4e00b82d14227178285868db4763 100644
--- a/src/vs/monaco.d.ts
+++ b/src/vs/monaco.d.ts
@@ -1115,6 +1115,10 @@ declare namespace monaco.editor {
 		 * Defaults to true.
 		 */
 		wordBasedSuggestions?: boolean;
+		/**
+		 * Controls whether word based completions should be included from opened documents of the same language or any language.
+		 */
+		wordBasedSuggestionsOnlySameLanguage?: boolean;
 		/**
 		 * Controls whether the semanticHighlighting is shown for the languages that support it.
 		 * true: semanticHighlighting is enabled for all themes