diff --git a/bless/__about__.py b/bless/__about__.py
index e8805d6..6d53e01 100644
--- a/bless/__about__.py
+++ b/bless/__about__.py
@@ -9,7 +9,7 @@
     "sign SSH public keys.")
 __uri__ = "https://github.com/Netflix/bless"
 
-__version__ = "0.3.0"
+__version__ = "0.4.0"
 
 __author__ = "The BLESS developers"
 __email__ = "security@netflix.com"
diff --git a/bless/request/bless_request_host.py b/bless/request/bless_request_host.py
index 364316b..5729334 100644
--- a/bless/request/bless_request_host.py
+++ b/bless/request/bless_request_host.py
@@ -52,7 +52,7 @@ class BlessHostRequest:
     def __init__(self, hostnames, public_key_to_sign):
         """
         A BlessRequest must have the following key value pairs to be valid.
-        :param hostnames: Comma-separated list of hostnames (s) to include in this host certificate.
+        :param hostnames: Comma-separated list of hostname(s) to include in this host certificate.
         :param public_key_to_sign: The id_XXX.pub that will be used in the SSH request. This is enforced in the issued certificate.
         """
         self.hostnames = hostnames
diff --git a/bless_client/bless_client_host.py b/bless_client/bless_client_host.py
new file mode 100644
index 0000000..94654a0
--- /dev/null
+++ b/bless_client/bless_client_host.py
@@ -0,0 +1,80 @@
+#!/usr/bin/env python
+
+"""bless_client
+A sample client to invoke the BLESS Host SSH Cert Lambda function and save the signed SSH Certificate.
+
+Usage:
+  bless_client_host.py region lambda_function_name hostnames <id_rsa.pub to sign> <output id_rsa-cert.pub>
+
+    region: AWS region where your lambda is deployed.
+
+    lambda_function_name: The AWS Lambda function's alias or ARN to invoke.
+
+    hostnames: Comma-separated list of hostname(s) to include in this host certificate.
+
+    id_rsa.pub to sign: The id_rsa.pub that will be used in the SSH request.  This is
+    enforced in the issued certificate.
+
+    output id_rsa-cert.pub: The file where the certificate should be saved.  Per man SSH(1):
+        "ssh will also try to load certificate information from the filename
+        obtained by appending -cert.pub to identity filenames" e.g.  the <id_rsa.pub to sign>.
+"""
+import json
+import os
+import stat
+import sys
+
+import boto3
+
+
+def main(argv):
+    if len(argv) != 5:
+        print(
+            'Usage: bless_client_host.py region lambda_function_name hostnames <id_rsa.pub to sign> '
+            '<output id_rsa-cert.pub>')
+        print(len(argv))
+        return -1
+
+    region, lambda_function_name, hostnames, public_key_filename, certificate_filename = argv
+
+    with open(public_key_filename, 'r') as f:
+        public_key = f.read().strip()
+
+    payload = {'hostnames': hostnames, 'public_key_to_sign': public_key}
+
+    payload_json = json.dumps(payload)
+
+    print('Executing:')
+    print('payload_json is: \'{}\''.format(payload_json))
+    lambda_client = boto3.client('lambda', region_name=region)
+    response = lambda_client.invoke(FunctionName=lambda_function_name,
+                                    InvocationType='RequestResponse', LogType='None',
+                                    Payload=payload_json)
+    print('{}\n'.format(response['ResponseMetadata']))
+
+    if response['StatusCode'] != 200:
+        print('Error creating cert.')
+        return -1
+
+    payload = json.loads(response['Payload'].read())
+
+    if 'certificate' not in payload:
+        print(payload)
+        return -1
+
+    cert = payload['certificate']
+
+    with os.fdopen(os.open(certificate_filename, os.O_WRONLY | os.O_CREAT, 0o600),
+                   'w') as cert_file:
+        cert_file.write(cert)
+
+    # If cert_file already existed with the incorrect permissions, fix them.
+    file_status = os.stat(certificate_filename)
+    if 0o600 != (file_status.st_mode & 0o777):
+        os.chmod(certificate_filename, stat.S_IRUSR | stat.S_IWUSR)
+
+    print('Wrote Certificate to: ' + certificate_filename)
+
+
+if __name__ == '__main__':
+    main(sys.argv[1:])