diff --git a/README.md b/README.md
index a3ef510..a3a4f26 100644
--- a/README.md
+++ b/README.md
@@ -80,6 +80,9 @@ mongodb_storage_smallfiles: false                # Very useful for non-data node
 mongodb_storage_journal_enabled: true            # Enable journaling
 mongodb_storage_prealloc: true                   # Disable data file preallocation
 
+# WiredTiger Options
+mongodb_wiredtiger_cache_size: 1                 # Cache size for wiredTiger in GB
+
 ## systemLog Options
 ## The destination to which MongoDB sends all log output. Specify either 'file' or 'syslog'.
 ## If you specify 'file', you must also specify mongodb_systemlog_path.
diff --git a/defaults/main.yml b/defaults/main.yml
index e474a1f..1cd5b90 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -28,7 +28,7 @@ mongodb_net_ipv6: false                          # Enable IPv6 support (disabled
 mongodb_net_maxconns: 65536                      # Max number of simultaneous connections
 mongodb_net_port: 27017                          # Specify port number
 mongodb_net_ssl: disabled                        # Enable or disable ssl connections
-mongodb_net_ssl_mode:                            # Set the ssl mode (RequireSSL / PreferSSL / AllowSSL / disabled)
+mongodb_net_ssl_mode:                            # Set the ssl mode (RequireSSL / preferSSL / AllowSSL / disabled)
 mongodb_net_ssl_pemfile:                         # Location of the pemfile to use for ssl
 
 ## processManagement Options
diff --git a/templates/mongod.conf.j2 b/templates/mongod.conf.j2
index 9b8b3e8..720bc5d 100644
--- a/templates/mongod.conf.j2
+++ b/templates/mongod.conf.j2
@@ -12,7 +12,7 @@ net:
   {% if mongodb_net_ssl_pemfile is defined and mongodb_net_ssl_mode is defined and mongodb_net_ssl == 'enabled' -%}
   ssl:
     mode: {{ mongodb_net_ssl_mode }}
-    PEMKeyFile: {{ mongodb_net_ssl_pemfile }}.pem
+    PEMKeyFile: {{ mongodb_net_ssl_pemfile }}
   {% endif %}
 
 processManagement:
@@ -52,6 +52,12 @@ storage:
     smallFiles: {{ mongodb_storage_smallfiles | to_nice_json }}
   {% endif %}
 
+{% if mongodb_wiredtiger_cache_size is defined %}
+  wiredTiger:
+    engineConfig:
+      cacheSizeGB: {{ mongodb_wiredtiger_cache_size }}
+{% endif %}
+
 systemLog:
   destination: {{ mongodb_systemlog_destination }}
   {% if mongodb_systemlog_destination == 'file' -%}