diff --git a/n2vc/libjuju.py b/n2vc/libjuju.py
index 14e8467..9d9d08e 100644
--- a/n2vc/libjuju.py
+++ b/n2vc/libjuju.py
@@ -122,7 +122,10 @@
             )
             if controller:
                 await self.disconnect_controller(controller)
-            raise JujuControllerFailedConnecting(e)
+
+            raise JujuControllerFailedConnecting(
+                f"Error connecting to Juju controller: {e}"
+            )
 
     async def disconnect(self):
         """Disconnect"""