diff --git a/README.md b/README.md
index cb1ffa5..f2a77b0 100644
--- a/README.md
+++ b/README.md
@@ -169,7 +169,7 @@ invocation.prf.forEach(delegation => {
   // Is the proof in the revocation store?
   store.lookup(delegation).then(revocation => {
     // Is the revocation issuer in this proof chain?
-    if (delegators.includes(revocation.iss)) {
+    if (delegators.includes(revocation.sub)) {
       throw new Error("Invalidated via revocation by delegation issuer")
     }