diff --git a/app.py b/app.py
index 5400e8b..4676a2d 100644
--- a/app.py
+++ b/app.py
@@ -6,7 +6,7 @@ from moviepy import VideoFileClip
 from openai import OpenAI
 from pydub import AudioSegment
 
-PROMPT = "You will be provided a video transcription for which you are to generate a blog post in Markdown format summarizing the video contents."
+DEFAULT_PROMPT = "You will be provided a video transcription for which you are to generate a blog post in Markdown format summarizing the video contents."
 
 def main(args):
     openai_client = OpenAI()
@@ -34,10 +34,11 @@ def transcribe_audio(openai_client, audio):
         ])
 
 def summarize_transcription(openai_client, transcription):
+    prompt = os.getenv('OPENAI_RESPONSES_PROMPT', DEFAULT_PROMPT)
     responses_model = os.getenv('OPENAI_RESPONSES_MODEL', 'whisper-1')
     return client.responses.create(
             model=responses_model,
-            instructions=PROMPT,
+            instructions=prompt,
             input=transcription
             )