diff --git a/README.md b/README.md
index e4862e8..d2b649f 100644
--- a/README.md
+++ b/README.md
@@ -126,7 +126,7 @@ a message their path between single quotes (').
 - Vim-like key bindings are also available, use `hjkl` to navigate between
 lists, use `i` to select the text area and `esc` to leave it.
 
-- Use Shift + Up or Shift + Down to navigate in your own message history.
+- Use `shift + Up` or `shift + Down` to navigate in your own message history.
 
 #### Troubleshooting
 
diff --git a/nctelegram b/nctelegram
index 120f17d..1ae6898 100755
--- a/nctelegram
+++ b/nctelegram
@@ -6,6 +6,17 @@ import os.path
 import configparser
 
 import ncTelegram
+import psutil
+
+
+
+# Check if telegram-cli is already running on the same port
+list_connection = [ i[4] for i in psutil.net_connections() ]
+for connection in list_connection:
+    if connection and connection[1] == 4458:
+        print('telegram-cli is already running, kill it before starting ncTelegram')
+        sys.exit(1)
+
 
 
 userconf = os.path.expanduser("~")+'/.ncTelegram.conf'