diff --git a/doc/user_guide/config.rst b/doc/user_guide/config.rst
index b95270e..faa3f88 100644
--- a/doc/user_guide/config.rst
+++ b/doc/user_guide/config.rst
@@ -46,7 +46,12 @@ two parts:
     .. image:: images/settings.png
 
   * The project ID
-  * The bucket name to store backup data
+  * The default bucket name to store backup data.
+    The bucket is created if not exists. Used as *container* parameter value
+    when Cinder CLI or API is invoked for creating a backup.
+    *Note for Horizon users:* make sure *Container Name* in
+    *Create Volume Backup* window is filled with the appropriate bucket name.
+    Improper or empty *Container Name* can cause a new bucket creation.
   * The storage class for the bucket, can be selected from drop-down list
   * Bucket location, a list of locations can be found in
     `Google Cloud storage documentation <https://cloud.google.com/storage/docs/bucket-locations>`_
diff --git a/environment_config.yaml b/environment_config.yaml
index 7ca74a1..22520bc 100644
--- a/environment_config.yaml
+++ b/environment_config.yaml
@@ -10,13 +10,13 @@ attributes:
       error:  'The value should not be empty. Only letters, digits, underscore and dash symbols are allowed.'
   backup_gcs_bucket:
     value: ''
-    label: 'GCS bucket name'
-    description: ''
+    label: 'Default GCS bucket name'
+    description: 'Default GCS bucket name to use for backups. The bucket is created if not exists. Please refer to the official bucket naming guidelines https://cloud.google.com/storage/docs/naming .Used as container parameter value when Cinder CLI or API is invoked for creating a backup.'
     weight: 15
     type: "text"
     regex:
       source: '^[A-Za-z\d_-]+$'
-      error:  'The value should not be empty. Only letters, digits, underscore and dash symbols are allowed.'
+      error:  'Default GCS bucket name to use for backups. The bucket is created if not exists. Please refer to the official bucket naming guidelines https://cloud.google.com/storage/docs/naming .Used as container parameter value when Cinder CLI or API is invoked for creating a backup. The value should not be empty. Only letters, digits, underscore and dash symbols are allowed.'
   backup_gcs_storage_class:
     value: 'NEARLINE'
     label: 'GCS storage class'
diff --git a/specs/spec.rst b/specs/spec.rst
index 45718a5..fb49a41 100644
--- a/specs/spec.rst
+++ b/specs/spec.rst
@@ -97,13 +97,15 @@ The settings are:
   * default value: ''
   * valid values: not empty
 
-* GCS Bucket
+* Default GCS Bucket name
 
   * name: backup_gcs_bucket
-  * label: GCS Bucket
-  * description: GCS bucket name to use for backup. Please refer to
-    the official bucket naming guidelines
-    https://cloud.google.com/storage/docs/naming
+  * label: Default GCS Bucket name
+  * description: Default GCS bucket name to use for backups. The bucket is
+    created if not exists. Please refer to the official bucket naming guidelines
+    https://cloud.google.com/storage/docs/naming .
+    Used as *container* parameter value when Cinder CLI or API is invoked for
+    creating a backup.
   * type: text
   * default value: ''
   * valid values: not empty