diff --git a/Meta/Lagom/Tools/LibJSGCVerifier/README.md b/Meta/Lagom/Tools/LibJSGCVerifier/README.md
index 9e0545f14d..18a3590bd8 100644
--- a/Meta/Lagom/Tools/LibJSGCVerifier/README.md
+++ b/Meta/Lagom/Tools/LibJSGCVerifier/README.md
@@ -7,9 +7,18 @@ two things:
 - For all types not wrapped by `GCPtr` or `NonnullGCPtr`, that the wrapped type does not inherit from `Cell`
   (otherwise it should be wrapped).
 
-Usage:
+This tool currently requires having first built Serenity with the Clang toolchain for x86_64:
+```bash
+./Meta/serenity.sh build x86_64 Clang
 ```
+
+Once Serenity is built, this tool can be built with:
+```bash
 cmake -GNinja -B build
 cmake --build build
+```
+
+Then run the tool with:
+```bash
 src/main.py -b <path to serenity>/Build
 ```
diff --git a/Meta/Lagom/Tools/LibJSGCVerifier/src/main.py b/Meta/Lagom/Tools/LibJSGCVerifier/src/main.py
index e8d1fc2616..a96cd14bb1 100755
--- a/Meta/Lagom/Tools/LibJSGCVerifier/src/main.py
+++ b/Meta/Lagom/Tools/LibJSGCVerifier/src/main.py
@@ -1,4 +1,4 @@
-#!/bin/python3
+#!/usr/bin/env python3
 
 import argparse
 import multiprocessing