diff --git a/rockcraft/commands/extensions.py b/rockcraft/commands/extensions.py
index 7e2266c20..daabb3881 100644
--- a/rockcraft/commands/extensions.py
+++ b/rockcraft/commands/extensions.py
@@ -82,10 +82,10 @@ class ExtensionsCommand(ListExtensionsCommand, abc.ABC):
 
 
 class ExpandExtensionsCommand(AppCommand, abc.ABC):
-    """Expand the extensions in the snapcraft.yaml file."""
+    """Expand the extensions in the rockcraft.yaml file."""
 
     name = "expand-extensions"
-    help_msg = "Expand extensions in snapcraft.yaml"
+    help_msg = "Expand extensions in rockcraft.yaml"
     overview = textwrap.dedent(
         """
         Extensions listed rockcraft.yaml will be