diff --git a/INTEROP.md b/INTEROP.md
index 1d9b8eb61..402396374 100644
--- a/INTEROP.md
+++ b/INTEROP.md
@@ -57,7 +57,7 @@ the system with 64 validators and the genesis time set to the current unix times
 Wait a bit until your beacon chain starts, and in the other window:
 
 ```
-bazel run //validator -- --interop-num-validators 64
+bazel run //validator -- --keymanager=interop --keymanageropts='{"keys":64}'
 ```
 
 This will launch and kickstart the system with your 64 validators performing their duties accordingly.
@@ -78,13 +78,7 @@ Assuming you generated a `genesis.ssz` file with 64 validators, open up two term
 Wait a bit until your beacon chain starts, and in the other window:
 
 ```
-bazel run //validator -- --interop-num-validators 64
+bazel run //validator -- --keymanager=interop --keymanageropts='{"keys":64}'
 ```
 
 This will launch and kickstart the system with your 64 validators performing their duties accordingly.
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diff --git a/README.md b/README.md
index 8a8fd0d47..6ee6b1a3a 100644
--- a/README.md
+++ b/README.md
@@ -208,7 +208,7 @@ bazel run //beacon-chain -- \
 Wait a moment for the beacon chain to start. In the other terminal, issue the command:
 
 ```text
-bazel run //validator -- --interop-num-validators 64
+bazel run //validator -- --keymanager=interop --keymanageropts='{"keys":64}'
 ```
 
 This command will kickstart the system with your 64 validators performing their duties accordingly.