diff --git a/README.md b/README.md
index 105041a..2b081ce 100644
--- a/README.md
+++ b/README.md
@@ -145,7 +145,7 @@ Manifest {
       key: {
         method: string,
         uri: string,
-        iv: string
+        iv: Uint32Array
       },
       map: {
         uri: string,