diff --git a/create venv file/create venv file.txt b/create venv file/create venv file.txt
index c2005693d8ce04a1cf9e3eef66aa004ebb56a559..e1ac32edf653719016d4a9c79b51992bad5fd5d9 100644
--- a/create venv file/create venv file.txt	
+++ b/create venv file/create venv file.txt	
@@ -14,6 +14,8 @@ Git command meaning:
     
 vs code remote ssh connecting error on raspberry pi:
     sudo rm -r .vscode* ( This command remove vs code server to RPI.)
+This is linux cmd:
+    rm -f ~/ .ssh/known_hosts ( warning remot host identification has changed delete old known_hosts.)
 
 Activate This Venv File:
     source iotcloud/bin/activate