diff --git a/meshtastic/__main__.py b/meshtastic/__main__.py
index 87342329..56717177 100644
--- a/meshtastic/__main__.py
+++ b/meshtastic/__main__.py
@@ -1321,7 +1321,7 @@ def initParser():
         action="store_true",
     )
 
-    parser.add_argument("--setalt", help="Set device altitude (allows use without GPS)")
+    parser.add_argument("--setalt", help="Set device altitude in meters (allows use without GPS)")
 
     parser.add_argument("--setlat", help="Set device latitude (allows use without GPS)")