diff --git a/lib/facts/blob-service.js b/lib/facts/blob-service.js
index 35e89d3e9..191e3af2a 100644
--- a/lib/facts/blob-service.js
+++ b/lib/facts/blob-service.js
@@ -1,32 +1,34 @@
 // @flow
 
+type BlobServicePath = '/blob/:blobHash' | '/blob';
+
 export type BlobServiceHTTPEndpoint = {
-  +path: string,
+  +path: BlobServicePath,
   +method: 'GET' | 'POST' | 'PUT' | 'DELETE',
 };
 
 const httpEndpoints = Object.freeze({
   GET_BLOB: {
     path: '/blob/:blobHash',
     method: 'GET',
   },
   ASSIGN_HOLDER: {
     path: '/blob',
     method: 'POST',
   },
   UPLOAD_BLOB: {
     path: '/blob',
     method: 'PUT',
   },
   DELETE_BLOB: {
     path: '/blob',
     method: 'DELETE',
   },
 });
 
 const config = {
   url: 'https://blob.commtechnologies.org',
   httpEndpoints,
 };
 
 export default config;