diff --git a/api-ref/source/v3/projects.inc b/api-ref/source/v3/projects.inc
index 348b9c2a15..4ae156e673 100644
--- a/api-ref/source/v3/projects.inc
+++ b/api-ref/source/v3/projects.inc
@@ -36,6 +36,9 @@ relevant resource creation allows this.
   is constrained to the characters in the Basic Multilingual Plane (BMP).
   Supplementary characters are not permitted. Note that this last restriction is
   generally true for all ``names`` within resources of the Identity API.
+  Creating a project without using a domain scoped token, i.e. using a project
+  scoped token or a system scoped token, and also without specifying a domain or
+  domain_id, the project will automatically be created on the default domain.
 
 
 List projects
diff --git a/doc/source/admin/cli-manage-projects-users-and-roles.rst b/doc/source/admin/cli-manage-projects-users-and-roles.rst
index 2899b38afc..f27979d2c2 100644
--- a/doc/source/admin/cli-manage-projects-users-and-roles.rst
+++ b/doc/source/admin/cli-manage-projects-users-and-roles.rst
@@ -83,6 +83,10 @@ Create a project named ``new-project``:
    | tags        | []                               |
    +-------------+----------------------------------+
 
+-  Creating a project without using a domain scoped token, i.e. using a project
+   scoped token or a system scoped token, and also without specifying a domain
+   or domain_id, the project will automatically be created on the default domain.
+
 Update a project
 ----------------