diff --git a/app/chat.py b/app/chat.py
index db48172..3cbeff9 100644
--- a/app/chat.py
+++ b/app/chat.py
@@ -6,8 +6,9 @@
 )
 from langchain.schema import HumanMessage, SystemMessage
 
-chat = ChatVertexAI()
-
+project_id = "gcu-022"  # Replace with your actual project ID
+chat = ChatVertexAI(project_id = project_id)    # adding project id to the ChatVertexAI constructor is compulsory because it enables the chat model to authenticate and authorize its operations using the specified project. 
+# This allows the model to access the required resources and services associated with your project, such as language processing capabilities, storage, and other APIs.
 
 async def chat(commons):
     messages = [