diff --git a/docs/upgrading.md b/docs/upgrading.md
index 5e54888c9489633501d51aac268cda464b94a37e..3c0e7c520f27db99d190758dfa1cf089ee67291e 100644
--- a/docs/upgrading.md
+++ b/docs/upgrading.md
@@ -15,4 +15,4 @@ intervention.
 
 * remove all helm charts (WARNING: Please backup all data before!):
 
-    `helm delete --purge oas-prod-cert-manager oas-prod-local-storage oas-prod-prometheus oas-prod-proxy`
+    `helm delete --purge oas-test-cert-manager oas-test-local-storage oas-test-prometheus oas-test-proxy oas-test-files`
diff --git a/openappstack/cluster.py b/openappstack/cluster.py
index e795f8e49fdd2c21015c752b5b18752c15139120..8d1b0ea8b0fc62bec11720e4e835b21731747296 100644
--- a/openappstack/cluster.py
+++ b/openappstack/cluster.py
@@ -153,7 +153,7 @@ class Cluster:
         file_contents = yaml.safe_dump(settings, default_flow_style=False)
         log.debug(file_contents)
 
-        # Create CLUSTER_DIR/group_vars/all/ is non-existant
+        # Create CLUSTER_DIR/group_vars/all/ if non-existent
         vars_dir = os.path.dirname(self.settings_file)
         if not os.path.exists(vars_dir):
             os.makedirs(vars_dir)
diff --git a/test/pytest/test_certs.py b/test/pytest/test_certs.py
index 93feb1a5a8e7f8014533c9d82601a22b9d1c2a96..294803496c76ed8e64a4f1521976dd34d705cf7d 100755
--- a/test/pytest/test_certs.py
+++ b/test/pytest/test_certs.py
@@ -97,7 +97,7 @@ def valid_cert(domain: str, ca_file: str = '/tmp/custom_ca_bundle.crt'):
 
 @pytest.mark.certs
 def test_cert_validation(host):
-    """Checks for proper cluster certs of exposed services.
+    """Checks for proper cluster certs from exposed services.
     Check is executed on the local provisioning machine.
     """