diff --git a/types/bull/index.d.ts b/types/bull/index.d.ts
index 97844cfbbb..e689629f04 100644
--- a/types/bull/index.d.ts
+++ b/types/bull/index.d.ts
@@ -273,18 +273,30 @@ declare namespace Bull {
      *
      * The callback is called everytime a job is placed in the queue.
      * It is passed an instance of the job as first argument.
+     * The callback can also be defined as the string path to a module
+     * exporting the callback function. Using a path has several advantages:
+     * - The process is sandboxed so if it crashes it does not affect the worker.
+     * - You can run blocking code without affecting the queue (jobs will not stall).
+     * - Much better utilization of multi-core CPUs.
+     * - Less connections to redis.
      *
      * A promise must be returned to signal job completion.
      * If the promise is rejected, the error will be passed as a second argument to the "failed" event.
      * If it is resolved, its value will be the "completed" event's second argument.
      */
-    process(callback: (job: Job) => void): Promise<any>;
+    process(callback: ((job: Job) => void) | string): Promise<any>;
 
     /**
      * Defines a processing function for the jobs placed into a given Queue.
      *
      * The callback is called everytime a job is placed in the queue.
      * It is passed an instance of the job as first argument.
+     * The callback can also be defined as the string path to a module
+     * exporting the callback function. Using a path has several advantages:
+     * - The process is sandboxed so if it crashes it does not affect the worker.
+     * - You can run blocking code without affecting the queue (jobs will not stall).
+     * - Much better utilization of multi-core CPUs.
+     * - Less connections to redis.
      *
      * A promise must be returned to signal job completion.
      * If the promise is rejected, the error will be passed as a second argument to the "failed" event.
@@ -292,7 +304,7 @@ declare namespace Bull {
      *
      * @param concurrency Bull will then call you handler in parallel respecting this max number.
      */
-    process(concurrency: number, callback: (job: Job) => void): Promise<any>;
+    process(concurrency: number, callback: ((job: Job) => void) | string): Promise<any>;
 
     /**
      * Defines a processing function for the jobs placed into a given Queue.
@@ -314,6 +326,12 @@ declare namespace Bull {
      *
      * The callback is called everytime a job is placed in the queue.
      * It is passed an instance of the job as first argument.
+     * The callback can also be defined as the string path to a module
+     * exporting the callback function. Using a path has several advantages:
+     * - The process is sandboxed so if it crashes it does not affect the worker.
+     * - You can run blocking code without affecting the queue (jobs will not stall).
+     * - Much better utilization of multi-core CPUs.
+     * - Less connections to redis.
      *
      * A promise must be returned to signal job completion.
      * If the promise is rejected, the error will be passed as a second argument to the "failed" event.
@@ -322,7 +340,7 @@ declare namespace Bull {
      * @param name Bull will only call the handler if the job name matches
      */
     // tslint:disable-next-line:unified-signatures
-    process(name: string, callback: (job: Job) => void): Promise<any>;
+    process(name: string, callback: ((job: Job) => void) | string): Promise<any>;
 
     /**
      * Defines a processing function for the jobs placed into a given Queue.
@@ -345,6 +363,12 @@ declare namespace Bull {
      *
      * The callback is called everytime a job is placed in the queue.
      * It is passed an instance of the job as first argument.
+     * The callback can also be defined as the string path to a module
+     * exporting the callback function. Using a path has several advantages:
+     * - The process is sandboxed so if it crashes it does not affect the worker.
+     * - You can run blocking code without affecting the queue (jobs will not stall).
+     * - Much better utilization of multi-core CPUs.
+     * - Less connections to redis.
      *
      * A promise must be returned to signal job completion.
      * If the promise is rejected, the error will be passed as a second argument to the "failed" event.
@@ -353,7 +377,7 @@ declare namespace Bull {
      * @param name Bull will only call the handler if the job name matches
      * @param concurrency Bull will then call you handler in parallel respecting this max number.
      */
-    process(name: string, concurrency: number, callback: (job: Job) => void): Promise<any>;
+    process(name: string, concurrency: number, callback: ((job: Job) => void) | string): Promise<any>;
 
     /**
      * Defines a processing function for the jobs placed into a given Queue.