diff --git a/jquery/jquery-tests.ts b/jquery/jquery-tests.ts
index 4fb31f0ed..db8309e06 100644
--- a/jquery/jquery-tests.ts
+++ b/jquery/jquery-tests.ts
@@ -2302,3 +2302,17 @@ $.when("asdf", "jkl;").done(x => x.length, x=> x.length);
 var f1 = $.when("fetch"); // Is type JQueryPromise<string>
 var f2: JQueryPromise<string[]> = f1.then(s => [s, s]);
 var f3: JQueryPromise<number> = f2.then(v => 3);
+
+// ISSUE: https://github.com/borisyankov/DefinitelyTyped/issues/742
+// http://stackoverflow.com/questions/5392344/sending-multipart-formdata-with-jquery-ajax#answer-5976031
+$.ajax({
+    url: 'php/upload.php',
+    data: {},
+    cache: false,
+    contentType: false,
+    processData: false,
+    type: 'POST',
+    success: function (data) {
+        alert(data);
+    }
+});
\ No newline at end of file
diff --git a/jquery/jquery.d.ts b/jquery/jquery.d.ts
index 57dfff6be..1f1969814 100644
--- a/jquery/jquery.d.ts
+++ b/jquery/jquery.d.ts
@@ -25,7 +25,9 @@ interface JQueryAjaxSettings {
     cache?: boolean;
     complete? (jqXHR: JQueryXHR, textStatus: string);
     contents?: { [key: string]: any; };
-    contentType?: string;
+    //According to jQuery.ajax source code, ajax's option actually allows contentType to set to "false"
+    // https://github.com/borisyankov/DefinitelyTyped/issues/742
+    contentType?: any;
     context?: any;
     converters?: { [key: string]: any; };
     crossDomain?: boolean;
diff --git a/requirejs/require-tests.ts b/requirejs/require-tests.ts
index 182ff785c..5788eabeb 100644
--- a/requirejs/require-tests.ts
+++ b/requirejs/require-tests.ts
@@ -36,4 +36,9 @@ require(['main'], (main, $, _, Backbone) => {
 	var app = main.AppMain();
 	app.run();
 
-});
\ No newline at end of file
+});
+
+// ISSUE: https://github.com/borisyankov/DefinitelyTyped/issues/764
+var recOne = requirejs.config({ baseUrl: 'js' });
+recOne(['core'], function (core) {/*some code*/});
+
diff --git a/requirejs/require.d.ts b/requirejs/require.d.ts
index ed9fbad28..711321b7d 100644
--- a/requirejs/require.d.ts
+++ b/requirejs/require.d.ts
@@ -126,8 +126,8 @@ interface RequireMap {
 
 interface Require {	
 
-	// Configure require.js
-	config(config: RequireConfig): void;
+    // Configure require.js
+    config(config: RequireConfig): Require;
 
 	// Start the main app logic.
 	// Callback is optional.