diff --git a/README.md b/README.md
index d5136da..a18f55e 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,6 @@
+<!---
+WARNING: DO NOT EDIT THIS FILE DIRECTLY. IT IS GENERATED BY src/pull_available_models.py
+--->
 # Free LLM API resources
 
 This lists various services that provide free access or credits towards API-based LLM usage.
diff --git a/src/pull_available_models.py b/src/pull_available_models.py
index 95c66fa..866bb16 100644
--- a/src/pull_available_models.py
+++ b/src/pull_available_models.py
@@ -820,8 +820,12 @@ def main():
     script_dir = os.path.dirname(os.path.abspath(__file__))
     with open(os.path.join(script_dir, "README_template.md"), "r") as f:
         readme = f.read()
+    warning = """<!---
+WARNING: DO NOT EDIT THIS FILE DIRECTLY. IT IS GENERATED BY src/pull_available_models.py
+--->
+"""
     with open(os.path.join(script_dir, "..", "README.md"), "w") as f:
-        f.write(readme.replace("{{MODEL_LIST}}", table).replace("{{TRIAL_MODEL_LIST}}", trial_table))
+        f.write((warning + readme).replace("{{MODEL_LIST}}", table).replace("{{TRIAL_MODEL_LIST}}", trial_table))
     logger.info("Wrote models to README.md")