diff --git a/warehouse/locale/messages.pot b/warehouse/locale/messages.pot
index b747e5f52ecf..567b190f9bea 100644
--- a/warehouse/locale/messages.pot
+++ b/warehouse/locale/messages.pot
@@ -570,14 +570,14 @@ msgid "Invalid project name"
 msgstr ""
 
 #: warehouse/oidc/forms/_core.py:35
-msgid "This project name is already in use"
+msgid "This project already exists, create an ordinary Trusted Publisher instead"
 msgstr ""
 
-#: warehouse/oidc/forms/_core.py:44
+#: warehouse/oidc/forms/_core.py:47
 msgid "Specify a publisher ID"
 msgstr ""
 
-#: warehouse/oidc/forms/_core.py:45
+#: warehouse/oidc/forms/_core.py:48
 msgid "Publisher must be specified by ID"
 msgstr ""
 
diff --git a/warehouse/oidc/forms/_core.py b/warehouse/oidc/forms/_core.py
index ce7659232122..e44ad59d4764 100644
--- a/warehouse/oidc/forms/_core.py
+++ b/warehouse/oidc/forms/_core.py
@@ -32,7 +32,10 @@ def validate_project_name(self, field):
 
         if project_name in self._project_factory:
             raise wtforms.validators.ValidationError(
-                _("This project name is already in use")
+                _(
+                    "This project already exists, create an ordinary Trusted "
+                    "Publisher instead"
+                )
             )