diff --git a/src/takopi/cli.py b/src/takopi/cli.py
index f5a187d..7a1a41b 100644
--- a/src/takopi/cli.py
+++ b/src/takopi/cli.py
@@ -101,6 +101,7 @@ def run(
         "--engine-option",
         "-E",
         help="Engine-specific override in KEY=VALUE form (repeatable).",
+        hidden=True,
     ),
 ) -> None:
     setup_logging(debug=debug)
diff --git a/src/takopi/engines.py b/src/takopi/engines.py
index f50f9da..b7d7b87 100644
--- a/src/takopi/engines.py
+++ b/src/takopi/engines.py
@@ -75,7 +75,10 @@ def _codex_build_runner(
 
     if overrides:
         unknown = ", ".join(sorted(overrides))
-        raise ConfigError(f"Unknown codex override(s): {unknown}")
+        raise ConfigError(
+            "Codex does not support --engine-option overrides yet. "
+            f"Remove: {unknown}"
+        )
 
     return CodexRunner(codex_cmd=codex_cmd, extra_args=extra_args, title=title)