diff --git a/doc/source/command-objects/flavor.rst b/doc/source/command-objects/flavor.rst
index 0900f2edf7..971628d720 100644
--- a/doc/source/command-objects/flavor.rst
+++ b/doc/source/command-objects/flavor.rst
@@ -42,9 +42,9 @@ Create new flavor
 
     Ephemeral disk size in GB (default 0G)
 
-.. option:: --swap <size-gb>
+.. option:: --swap <size-mb>
 
-    Swap space size in GB (default 0G)
+    Swap space size in MB (default 0M)
 
 .. option:: --vcpus <num-cpu>
 
diff --git a/openstackclient/compute/v2/flavor.py b/openstackclient/compute/v2/flavor.py
index e562cd40ca..7cd22ed7a9 100644
--- a/openstackclient/compute/v2/flavor.py
+++ b/openstackclient/compute/v2/flavor.py
@@ -89,9 +89,9 @@ class CreateFlavor(command.ShowOne):
         parser.add_argument(
             "--swap",
             type=int,
-            metavar="<size-gb>",
+            metavar="<size-mb>",
             default=0,
-            help=_("Swap space size in GB (default 0G)")
+            help=_("Swap space size in MB (default 0M)")
         )
         parser.add_argument(
             "--vcpus",