diff --git a/application/src/main/resources/thingsboard.yml b/application/src/main/resources/thingsboard.yml
index 83ff290476..95b3d769b0 100644
--- a/application/src/main/resources/thingsboard.yml
+++ b/application/src/main/resources/thingsboard.yml
@@ -685,7 +685,7 @@ transport:
           key_password: "${MQTT_SSL_PEM_KEY_PASSWORD:server_key_password}"
         # Keystore server credentials
         keystore:
-          # Type of the key store
+          # Type of the key store (JKS or PKCS12)
           type: "${MQTT_SSL_KEY_STORE_TYPE:JKS}"
           # Path to the key store that holds the SSL certificate
           store_file: "${MQTT_SSL_KEY_STORE:mqttserver.jks}"
diff --git a/transport/mqtt/src/main/resources/tb-mqtt-transport.yml b/transport/mqtt/src/main/resources/tb-mqtt-transport.yml
index 68a1f71f64..e45f5c29fc 100644
--- a/transport/mqtt/src/main/resources/tb-mqtt-transport.yml
+++ b/transport/mqtt/src/main/resources/tb-mqtt-transport.yml
@@ -125,7 +125,7 @@ transport:
           key_password: "${MQTT_SSL_PEM_KEY_PASSWORD:server_key_password}"
         # Keystore server credentials
         keystore:
-          # Type of the key store
+          # Type of the key store (JKS or PKCS12)
           type: "${MQTT_SSL_KEY_STORE_TYPE:JKS}"
           # Path to the key store that holds the SSL certificate
           store_file: "${MQTT_SSL_KEY_STORE:mqttserver.jks}"