diff --git a/packages/@jsii/runtime/bin/jsii-runtime.ts b/packages/@jsii/runtime/bin/jsii-runtime.ts
index 90a5f5377d..111bb70e95 100644
--- a/packages/@jsii/runtime/bin/jsii-runtime.ts
+++ b/packages/@jsii/runtime/bin/jsii-runtime.ts
@@ -9,8 +9,7 @@ import { Duplex } from 'stream';
 // Spawn another node process, with the following file descriptor setup:
 // - No STDIN will be provided
 // - STDOUT and STDERR will be intercepted, contents wrapped & forward to STDERR
-// - FD#3 is the communication pipe to read jsii API messages
-// - FD#4 is the communication pipe to write jsii API responses
+// - FD#3 is the communication pipe to read & write jsii API messages
 const child = spawn(
   process.execPath,
   [...process.execArgv, resolve(__dirname, '..', 'lib', 'program.js')],