diff --git a/releasenotes/notes/set-default-value-of-concurrency-to-2-d916d5c31e3725d5.yaml b/releasenotes/notes/set-default-value-of-concurrency-to-2-d916d5c31e3725d5.yaml
new file mode 100644
index 0000000..0d964a9
--- /dev/null
+++ b/releasenotes/notes/set-default-value-of-concurrency-to-2-d916d5c31e3725d5.yaml
@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    [`bug 1948935 <https://bugs.launchpad.net/tempest/+bug/1948935>`_]
+    The default value of account-generator --concurrency parameter is now
+    set to 2 instead of 1.
diff --git a/tempest/cmd/account_generator.py b/tempest/cmd/account_generator.py
index 917262e..ad0b547 100755
--- a/tempest/cmd/account_generator.py
+++ b/tempest/cmd/account_generator.py
@@ -81,11 +81,11 @@
   will have the prefix with the given TAG in its name. Using tag is recommended
   for the further using, cleaning resources.
 
-* ``-r, --concurrency CONCURRENCY`` (Optional) Concurrency count
-  (default: 1). The number of accounts required can be estimated as
-  CONCURRENCY x 2. Each user provided in *accounts.yaml* file will be in
-  a different tenant. This is required to provide isolation between test for
-  running in parallel.
+* ``-r, --concurrency CONCURRENCY`` (Optional) Concurrency count (default: 2).
+  The number of accounts generated will be same as CONCURRENCY. The higher the
+  number, the more tests will run in parallel. If you want to run tests
+  sequentially then use 1 as value for concurrency (beware that tests that need
+  more credentials will fail).
 
 * ``--with-admin`` (Optional) Creates admin for each concurrent group
   (default: False).
@@ -236,7 +236,7 @@
                         dest='tag',
                         help='Resources tag')
     parser.add_argument('-r', '--concurrency',
-                        default=1,
+                        default=2,
                         type=positive_int,
                         required=False,
                         dest='concurrency',