diff --git a/e4s_cl/cli/commands/launch.py b/e4s_cl/cli/commands/launch.py
index 81c47d07..7c9ef258 100644
--- a/e4s_cl/cli/commands/launch.py
+++ b/e4s_cl/cli/commands/launch.py
@@ -241,6 +241,14 @@ def _construct_parser(self):
             metavar='image',
         )
 
+        parser.add_argument(
+            '--backend',
+            help="Container backend to use to launch the image." +
+            f" Available backends are: {', '.join(EXPOSED_BACKENDS)}",
+            metavar='technology',
+            dest='backend',
+        )
+
         parser.add_argument(
             '--source',
             type=arguments.posix_path,
@@ -263,11 +271,10 @@ def _construct_parser(self):
         )
 
         parser.add_argument(
-            '--backend',
-            help="Container backend to use to launch the image." +
-            f" Available backends are: {', '.join(EXPOSED_BACKENDS)}",
-            metavar='technology',
-            dest='backend',
+            '--wi4mpi',
+            type=arguments.posix_path,
+            help="Path towards a Wi4MPI installation to use",
+            metavar='installation',
         )
 
         mpi_families = set(map(lambda x: x.cli_name, WI4MPI_METADATA))