diff --git a/README.md b/README.md
index 635ff8a..c3f758c 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,7 @@ Resources:
         DBMasterUserPassword: '' # required if neither DBSnapshotIdentifier nor SecretModule is set
         DBMultiAZ: 'true' # optional
         SubDomainNameWithDot: 'postgres.' # optional
+        ParameterGroupName: '' #optional
         # Set this to the version of PostgreSQL you want to use.
         # You can run the following command to get the list of PostgreSQL versions supported by AWS RDS:
         # aws rds describe-db-engine-versions --engine postgres --query "DBEngineVersions[].EngineVersion"
@@ -180,6 +181,13 @@ Resources:
       <td>no</td>
       <td></td>
     </tr>
+    <tr>
+      <td>ParameterGroupName</td>
+      <td>parameter group that contains configuration settings for the database engine you're using</td>
+      <td></td>
+      <td>no</td>
+      <td></td>
+    </tr>
     <tr>
       <td>EngineVersion</td>
       <td>The PostgreSQL version.</td>
diff --git a/module.yml b/module.yml
index e8e7f82..0d547d1 100644
--- a/module.yml
+++ b/module.yml
@@ -92,6 +92,10 @@ Parameters:
     Type: String
     AllowedValues: ['true', 'false']
     Default: 'false'
+  ParameterGroupName:
+    Description: 'Optional name of parameter group to attach to.'
+    Type: String
+    Default: ''
 Resources:
   Instance:
     Type: 'AWS::CloudFormation::Stack'
@@ -114,6 +118,7 @@ Resources:
         DBBackupRetentionPeriod: !Ref DBBackupRetentionPeriod
         DBMasterUsername: !Ref DBMasterUsername
         DBMasterUserPassword: !Ref DBMasterUserPassword
+        DBParameterGroupName: !Ref ParameterGroupName
         DBMultiAZ: !Ref DBMultiAZ
         SubDomainNameWithDot: !Ref SubDomainNameWithDot
         EnableIAMDatabaseAuthentication: !Ref EnableIAMDatabaseAuthentication
diff --git a/test/dbparameter.js b/test/dbparameter.js
new file mode 100644
index 0000000..7e594c4
--- /dev/null
+++ b/test/dbparameter.js
@@ -0,0 +1,18 @@
+const test = require('ava');
+const cfntest = require('@cfn-modules/test');
+
+test.serial('dbparameter', async t => {
+  const stackName = cfntest.stackName();
+  try {
+    t.log(await cfntest.createStack(`${__dirname}/dbparameter.yml`, stackName, {}));
+    // what could we test here?
+  } finally {
+    t.log(await cfntest.deleteStack(stackName));
+    t.pass();
+  }
+});
+
+// TODO test with-alerting
+// TODO test with-hosted-zone-private
+// TODO test with-bastion (SQL access)
+// TODO test with-kms
diff --git a/test/dbparameter.yml b/test/dbparameter.yml
new file mode 100644
index 0000000..cba1266
--- /dev/null
+++ b/test/dbparameter.yml
@@ -0,0 +1,29 @@
+---
+AWSTemplateFormatVersion: '2010-09-09'
+Description: 'cfn-modules test'
+Resources:
+  Vpc:
+    Type: 'AWS::CloudFormation::Stack'
+    Properties:
+      Parameters:
+        S3Endpoint: 'false' # speed up the test
+        DynamoDBEndpoint: 'false' # speed up the test
+        FlowLog: 'false' # speed up the test
+        NatGateways: 'false' # speed up the test
+      TemplateURL: './node_modules/@cfn-modules/vpc/module.yml'
+  ClientSg:
+    Type: 'AWS::CloudFormation::Stack'
+    Properties:
+      Parameters:
+        VpcModule: !GetAtt 'Vpc.Outputs.StackName'
+      TemplateURL: './node_modules/@cfn-modules/client-sg/module.yml'
+  Database:
+    Type: 'AWS::CloudFormation::Stack'
+    Properties:
+      Parameters:
+        VpcModule: !GetAtt 'Vpc.Outputs.StackName'
+        ClientSgModule: !GetAtt 'ClientSg.Outputs.StackName'
+        DBMasterUserPassword: 'test1234'
+        ParameterGroupName: 'default.postgres14' # using default parameter
+        EngineVersion: '14.12'
+      TemplateURL: './node_modules/@cfn-modules/rds-postgres/module.yml'