diff --git a/clientele/cli.py b/clientele/cli.py
index 9e114ee..74155bb 100644
--- a/clientele/cli.py
+++ b/clientele/cli.py
@@ -62,13 +62,16 @@ def validate(url, file):
 
 
 @click.command()
-@click.option("-u", "--url", help="URL to openapi schema (json file)", required=False)
-@click.option("-f", "--file", help="Path to openapi schema (json file)", required=False)
+@click.option("-u", "--url", help="URL to openapi schema (URL)", required=False)
+@click.option(
+    "-f", "--file", help="Path to openapi schema (json or yaml file)", required=False
+)
 @click.option(
     "-o", "--output", help="Directory for the generated client", required=True
 )
-@click.option("-a", "--asyncio", help="Use Async.IO", required=False)
-def generate(url, file, output, asyncio):
+@click.option("-a", "--asyncio", help="Generate async client", required=False)
+@click.option("-r", "--regen", help="Regenerate client", required=False)
+def generate(url, file, output, asyncio, regen):
     """
     Generate a new client from an OpenAPI schema
     """
@@ -106,13 +109,15 @@ def generate(url, file, output, asyncio):
             f"[red]Clientele only supports OpenAPI version 3.0.0 and up, and you have {spec['openapi']}"
         )
         return
-    Generator(
-        spec=spec, asyncio=asyncio, output_dir=output, url=url, file=file
-    ).generate()
-    console.log("\n[green]⚜️ Client generated! ⚜️ \n")
-    console.log(
-        "[yellow]REMEMBER: install `httpx` `pydantic`, and `respx` to use your new client"
+    generator = Generator(
+        spec=spec, asyncio=asyncio, regen=regen, output_dir=output, url=url, file=file
     )
+    if generator.prevent_accidental_regens():
+        generator.generate()
+        console.log("\n[green]⚜️ Client generated! ⚜️ \n")
+        console.log(
+            "[yellow]REMEMBER: install `httpx` `pydantic`, and `respx` to use your new client"
+        )
 
 
 cli_group.add_command(generate)
diff --git a/clientele/generator.py b/clientele/generator.py
index 542a70f..332637f 100644
--- a/clientele/generator.py
+++ b/clientele/generator.py
@@ -5,6 +5,7 @@
 from typing import Optional
 
 from openapi_core import Spec
+from rich.console import Console
 
 from clientele.generators.clients import ClientsGenerator
 from clientele.generators.http import HTTPGenerator
@@ -18,6 +19,8 @@
 )
 from clientele.writer import write_to_manifest, write_to_http
 
+console = Console()
+
 
 class Generator:
     """
@@ -26,6 +29,7 @@ class Generator:
 
     spec: Spec
     asyncio: bool
+    regen: bool
     schemas_generator: SchemasGenerator
     clients_generator: ClientsGenerator
     http_generator: HTTPGenerator
@@ -38,6 +42,7 @@ def __init__(
         spec: Spec,
         output_dir: str,
         asyncio: bool,
+        regen: bool,
         url: Optional[str],
         file: Optional[str],
     ) -> None:
@@ -54,6 +59,7 @@ def __init__(
         )
         self.spec = spec
         self.asyncio = asyncio
+        self.regen = regen
         self.output_dir = output_dir
         self.file = file
         self.url = url
@@ -80,15 +86,24 @@ def generate_manifest(self):
         # ruff: noqa
         write_to_manifest(
             f"""
-Generated using this command:
+Regnerate using this command:
 
 ```sh
-clientele generate {f"-u {self.url}" if self.url else ""}{f"-f {self.file}" if self.file else ""} -o {self.output_dir} {"--asyncio t" if self.asyncio else ""}
+clientele generate {f"-u {self.url}" if self.url else ""}{f"-f {self.file}" if self.file else ""} -o {self.output_dir} {"--asyncio t" if self.asyncio else ""} --regen t
 ```
 """,
             self.output_dir,
         )
 
+    def prevent_accidental_regens(self) -> bool:
+        if exists(self.output_dir):
+            if not self.regen:
+                console.log(
+                    "[red]WARNING! If you want to regenerate, please pass --regen t"
+                )
+                return False
+        return True
+
     def generate(self) -> None:
         copy_tree(src=CLIENT_TEMPLATE_ROOT, dst=self.output_dir)
         if not exists(f"{self.output_dir}/config.py"):
diff --git a/tests/async_test_client/MANIFEST.md b/tests/async_test_client/MANIFEST.md
index f69842a..2ab58e8 100644
--- a/tests/async_test_client/MANIFEST.md
+++ b/tests/async_test_client/MANIFEST.md
@@ -11,8 +11,8 @@ API VERSION: 0.1.0
 OPENAPI VERSION: 3.0.2
 CLIENTELE VERSION: 0.7.0
 
-Generated using this command:
+Regnerate using this command:
 
 ```sh
-clientele generate -f example_openapi_specs/best.json -o tests/async_test_client/ --asyncio t
+clientele generate -f example_openapi_specs/best.json -o tests/async_test_client/ --asyncio t --regen t
 ```
diff --git a/tests/test_client/MANIFEST.md b/tests/test_client/MANIFEST.md
index 7c0e437..a4126ca 100644
--- a/tests/test_client/MANIFEST.md
+++ b/tests/test_client/MANIFEST.md
@@ -11,8 +11,8 @@ API VERSION: 0.1.0
 OPENAPI VERSION: 3.0.2
 CLIENTELE VERSION: 0.7.0
 
-Generated using this command:
+Regnerate using this command:
 
 ```sh
-clientele generate -f example_openapi_specs/best.json -o tests/test_client/ 
+clientele generate -f example_openapi_specs/best.json -o tests/test_client/  --regen t
 ```