diff --git a/README.md b/README.md
index e8674e38..8d6ae2e2 100644
--- a/README.md
+++ b/README.md
@@ -418,6 +418,7 @@ Any errors originating from Node.js will be passed on and we use [GOT](https://g
 
 - `code` (`string`) - [The Transloadit API error code](https://transloadit.com/docs/api/response-codes/#error-codes).
 - `rawMessage` (`string`) - A textual representation of the Transloadit API error.
+- `reason` (`string`) - Additional information about the Transloadit API error.
 - `assemblyId`: (`string`) - If the request is related to an assembly, this will be the ID of the assembly.
 - `assemblySslUrl` (`string`) - If the request is related to an assembly, this will be the SSL URL to the assembly .
 
diff --git a/src/ApiError.ts b/src/ApiError.ts
index 6ec4fe6d..03f5b185 100644
--- a/src/ApiError.ts
+++ b/src/ApiError.ts
@@ -3,6 +3,7 @@ import { HTTPError, RequestError } from 'got'
 export interface TransloaditErrorResponseBody {
   error?: string
   message?: string
+  reason?: string
   assembly_ssl_url?: string
   assembly_id?: string
 }
@@ -16,6 +17,8 @@ export class ApiError extends Error {
 
   rawMessage?: string
 
+  reason?: string
+
   assemblySslUrl?: string
 
   assemblyId?: string
@@ -36,6 +39,7 @@ export class ApiError extends Error {
 
     super(message)
     this.rawMessage = body.message
+    this.reason = body.reason
     this.assemblyId = body.assembly_id
     this.assemblySslUrl = body.assembly_ssl_url
     this.code = body.error
diff --git a/test/unit/mock-http.test.ts b/test/unit/mock-http.test.ts
index 9fedb3f9..0711127b 100644
--- a/test/unit/mock-http.test.ts
+++ b/test/unit/mock-http.test.ts
@@ -115,15 +115,18 @@ describe('Mocked API tests', () => {
   it('should throw error with error code', async () => {
     const client = getLocalClient()
 
-    nock('http://localhost')
-      .post(createAssemblyRegex)
-      .reply(400, { error: 'INVALID_FILE_META_DATA', message: 'Invalid file metadata' })
+    nock('http://localhost').post(createAssemblyRegex).reply(400, {
+      error: 'INVALID_FILE_META_DATA',
+      message: 'Invalid file metadata',
+      reason: 'Some reason',
+    })
 
     await expect(client.createAssembly()).rejects.toThrow(
       expect.objectContaining<ApiError>({
         name: 'ApiError',
         code: 'INVALID_FILE_META_DATA',
         rawMessage: 'Invalid file metadata',
+        reason: 'Some reason',
         message: 'API error (HTTP 400) INVALID_FILE_META_DATA: Invalid file metadata',
       })
     )
@@ -165,6 +168,7 @@ describe('Mocked API tests', () => {
       expect.stringMatching(`    at .+`),
       expect.stringMatching(`  code: 'INVALID_FILE_META_DATA',`),
       expect.stringMatching(`  rawMessage: 'Invalid file metadata',`),
+      expect.stringMatching(`  reason: undefined,`),
       expect.stringMatching(
         `  assemblySslUrl: 'https:\\/\\/api2-oltu\\.transloadit\\.com\\/assemblies\\/foo'`
       ),