diff --git a/README.md b/README.md
index 5408bbc..51ba0c9 100644
--- a/README.md
+++ b/README.md
@@ -7,3 +7,12 @@ Source: https://openai.com/
 
 ![https://github.com/Mariosmsk/QChatGPT/blob/main/example.png](https://github.com/Mariosmsk/QChatGPT/blob/main/example2.png)
 
+## Installation notes
+
+### macOS + QGIS 3
+
+* in a macOS shell window, run
+
+```
+/Applications/QGIS.app/Contents/MacOS/bin/python3 -m pip install openai
+```
diff --git a/qchatqpt.py b/qchatqpt.py
index 57b3ccf..d71479d 100644
--- a/qchatqpt.py
+++ b/qchatqpt.py
@@ -37,6 +37,7 @@
 import base64
 import sys
 import requests
+from collections import deque
 
 from .install_packages.check_dependencies import check
 
@@ -61,6 +62,8 @@ def __init__(self, iface):
         :type iface: QgsInterface
         """
         # Save reference to the QGIS interface
+
+        self.history = deque(maxlen=6)
         self.resp = None
         self.last_ans = None
         self.dlg = None
@@ -264,6 +267,18 @@ def send_message(self):
                 self.dlg.chatgpt_ans.verticalScrollBar().maximum())
         finally:
             if ask:
+                try:   
+                    question_history = " ".join(self.history) + " " + self.question
+                    self.response = openai.Completion.create(
+                        engine=model,
+                        prompt=question_history,
+                        temperature=temperature,
+                        max_tokens=max_tokens-len(question_history),
+                        top_p=1,
+                        frequency_penalty=0.0,
+                        presence_penalty=0.6,
+                    )
+                    
                 try:
                     if model == "gpt-3.5-turbo":
                         self.response = openai.ChatCompletion.create(
@@ -290,9 +305,12 @@ def send_message(self):
                                                         level=Qgis.Warning, duration=3)
                     self.dlg.send_chat.setEnabled(True)
                     self.dlg.question.setEnabled(True)
+                    
                     return
 
                 self.last_ans = self.response['choices'][0]['text']
+                conversation_pair = self.question + " " + self.last_ans
+                self.history.append(conversation_pair)                
                 last_ans = "AI: " + self.last_ans
                 self.answers.append(last_ans)
 
@@ -347,7 +365,8 @@ def add_on_map(self):
 
     def clear_ans_fun(self):
         self.questions = []
-        self.answers = ['Welcome to the QChatGPT.']
+        self.history = deque(maxlen=5)
+        self.answers = ['Welcome to the QChatGPT development version.']
         self.dlg.chatgpt_ans.clear()
         self.dlg.chatgpt_ans.append(self.answers[0])
 
@@ -368,7 +387,7 @@ def run(self):
 
         self.read_tok()
         self.questions = []
-        self.answers = ['Welcome to the QChatGPT.']
+        self.answers = ['Welcome to the QChatGPT development version.']
 
         # self.dlg.setWindowFlags(Qt.Dialog | Qt.WindowStaysOnTopHint | Qt.WindowMinMaxButtonsHint |
         #                        Qt.WindowCloseButtonHint)