diff --git a/plugins/readme-backend/package.json b/plugins/readme-backend/package.json
index f8939f5..c4a5614 100644
--- a/plugins/readme-backend/package.json
+++ b/plugins/readme-backend/package.json
@@ -32,6 +32,7 @@
     "@backstage/backend-plugin-api": "^0.8.0",
     "@backstage/catalog-client": "^1.6.6",
     "@backstage/catalog-model": "^1.6.0",
+    "@backstage/config": "^1.3.2",
     "@backstage/errors": "^1.2.4",
     "@backstage/integration": "^1.14.0",
     "@types/express": "*",
diff --git a/plugins/readme-backend/src/service/constants.ts b/plugins/readme-backend/src/service/constants.ts
index 689253c..1eb706c 100644
--- a/plugins/readme-backend/src/service/constants.ts
+++ b/plugins/readme-backend/src/service/constants.ts
@@ -1,13 +1,28 @@
 import { FileType } from './types';
+import { Config } from '@backstage/config';
 
 // Cache placeholder for entities where no readme
 export const NOT_FOUND_PLACEHOLDER = 'NOT_FOUND';
 export const DEFAULT_TTL = 1800 * 1000;
 
-export const README_TYPES: FileType[] = [
-  { name: 'README', type: 'text/plain' },
+const DEFAULT_README_TYPES: FileType[] = [
   { name: 'README.md', type: 'text/markdown' },
+  { name: 'README.MD', type: 'text/markdown' },
+  { name: 'README', type: 'text/plain' },
   { name: 'README.rst', type: 'text/plain' },
   { name: 'README.txt', type: 'text/plain' },
-  { name: 'README.MD', type: 'text/markdown' },
 ];
+
+export function getReadmeTypes(config: Config): FileType[] {
+  const readmeTypes = config.getOptionalStringArray('readme.types');
+  if (!readmeTypes) {
+    return DEFAULT_README_TYPES;
+  }
+  return readmeTypes.map(name => {
+    const type =
+      name.endsWith('.md') || name.endsWith('.MD')
+        ? 'text/markdown'
+        : 'text/plain';
+    return { name, type };
+  });
+}
diff --git a/plugins/readme-backend/src/service/router.ts b/plugins/readme-backend/src/service/router.ts
index b7c5368..e8a9c11 100644
--- a/plugins/readme-backend/src/service/router.ts
+++ b/plugins/readme-backend/src/service/router.ts
@@ -17,7 +17,11 @@ import { isError, NotFoundError } from '@backstage/errors';
 import express from 'express';
 import Router from 'express-promise-router';
 import { isSymLink } from '../lib';
-import { DEFAULT_TTL, NOT_FOUND_PLACEHOLDER, README_TYPES } from './constants';
+import {
+  DEFAULT_TTL,
+  NOT_FOUND_PLACEHOLDER,
+  getReadmeTypes,
+} from './constants';
 import { ReadmeFile } from './types';
 
 /**
@@ -97,7 +101,9 @@ export async function createRouter(
       return;
     }
 
-    for (const fileType of README_TYPES) {
+    const readmeTypes = getReadmeTypes(config);
+
+    for (const fileType of readmeTypes) {
       const url = integration.resolveUrl({
         url: fileType.name,
         base: source.target,