diff --git a/types/requestretry/index.d.ts b/types/requestretry/index.d.ts
index 0c9b68fe8d..150564e60e 100644
--- a/types/requestretry/index.d.ts
+++ b/types/requestretry/index.d.ts
@@ -3,6 +3,7 @@
 // Definitions by: 	Eric Byers <https://github.com/EricByers>
 // 				   				Andrew Throener <https://github.com/trainerbill>
 // 									Aniket Patel <https://github.com/baaka-ani>
+//                                  	Aram Elchyan <https://github.com/elch-yan>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
@@ -13,6 +14,7 @@ import http = require('http');
 
 declare namespace requestretry {
 	type RetryStrategy = (err: Error, response: http.IncomingMessage, body: any) => boolean;
+	type DelayStrategy = (err: Error, response: http.IncomingMessage, body: any) => number;
 	interface RequestPromise extends request.Request {
 		then: Promise<any>["then"];
 		catch: Promise<any>["catch"];
@@ -31,6 +33,7 @@ declare namespace requestretry {
 		promiseFactory?(resolver: any): any;
 		retryDelay?: number;
 		retryStrategy?: RetryStrategy;
+		delayStrategy?: DelayStrategy;
         fullResponse?: boolean;
 	}
 }
diff --git a/types/requestretry/requestretry-tests.ts b/types/requestretry/requestretry-tests.ts
index 4859ca9854..081ffe0d9a 100644
--- a/types/requestretry/requestretry-tests.ts
+++ b/types/requestretry/requestretry-tests.ts
@@ -81,6 +81,23 @@ request({
 	// Body.
 });
 
+const CustomDelayStrategy = (err: Error, response: http.IncomingMessage, body: any): number => {
+	// Return a number
+	return 100;
+};
+
+request({
+	url: 'https://api.example.com/v1/a/b',
+	json: true,
+	// The below parameters are specific to request-retry
+	// (default) try 5 times
+	maxAttempts: 5,
+	// (default) wait for 5s before trying again
+	delayStrategy: CustomDelayStrategy,
+}, (err, response, body) => {
+	// Body.
+});
+
 // No options required
 request({
 	url: 'https://api.example.com/v1/a/b',