diff --git a/src/types/opentimestamps.d.ts b/src/types/opentimestamps.d.ts
index 104a81b..5c45488 100644
--- a/src/types/opentimestamps.d.ts
+++ b/src/types/opentimestamps.d.ts
@@ -2,6 +2,7 @@ interface OpenTimestamps {
   // Create a detached timestamp file from a buffer or file hash
   DetachedTimestampFile: {
     fromHash(op: any, hash: Uint8Array): any
+    fromBytes(op: any, buffer: Uint8Array): any
   }
 
   // Stamp the provided timestamp file and return a Promise