diff --git a/doc/ot_api_doc.h b/doc/ot_api_doc.h
index 3a314d3e6..335a6e6d4 100644
--- a/doc/ot_api_doc.h
+++ b/doc/ot_api_doc.h
@@ -33,102 +33,103 @@
  */
 
 /**
- * @defgroup api  API
+ * @defgroup api                      API
  * @brief
  *   This module includes the application programming interface to the OpenThread stack.
  *
  * @{
  *
- * @defgroup api-error Error
+ * @defgroup api-error                Error
  *
- * @defgroup api-execution Execution
+ * @defgroup api-execution            Execution
  *
  * @{
  *
- * @defgroup api-instance Instance
- * @defgroup api-tasklets Tasklets
+ * @defgroup api-instance             Instance
+ * @defgroup api-tasklets             Tasklets
  *
  * @}
  *
- * @defgroup api-net IPv6 Networking
+ * @defgroup api-net                  IPv6 Networking
  * @{
  *
- * @defgroup api-dns         DNSv6
- * @defgroup api-icmp6       ICMPv6
- * @defgroup api-ip6         IPv6
- * @defgroup api-udp-group   UDP
+ * @defgroup api-dns                  DNSv6
+ * @defgroup api-icmp6                ICMPv6
+ * @defgroup api-ip6                  IPv6
+ * @defgroup api-udp-group            UDP
  *
  * @{
  *
- * @defgroup api-udp         UDP
- * @defgroup api-udp-forward UDP Forward
+ * @defgroup api-udp                  UDP
+ * @defgroup api-udp-forward          UDP Forward
  *
  * @}
  *
  * @}
  *
- * @defgroup api-link Link
+ * @defgroup api-link                 Link
  *
  * @{
  *
- * @defgroup api-link-link Link
- * @defgroup api-link-raw  Raw Link
+ * @defgroup api-link-link            Link
+ * @defgroup api-link-raw             Raw Link
  *
  * @}
  *
- * @defgroup api-message Message
+ * @defgroup api-message              Message
  *
- * @defgroup api-thread Thread
+ * @defgroup api-thread               Thread
  *
  * @{
  *
- * @defgroup api-border-agent   Border Agent
- * @defgroup api-border-router  Border Router
- * @defgroup api-commissioner   Commissioner
- * @defgroup api-thread-general General
+ * @defgroup api-backbone-router      Backbone Router
+ * @defgroup api-border-agent         Border Agent
+ * @defgroup api-border-router        Border Router
+ * @defgroup api-commissioner         Commissioner
+ * @defgroup api-thread-general       General
  * @brief This module includes functions for all Thread roles.
- * @defgroup api-joiner         Joiner
- * @defgroup api-thread-router  Router/Leader
+ * @defgroup api-joiner               Joiner
+ * @defgroup api-thread-router        Router/Leader
  * @brief This module includes functions for Thread Routers and Leaders.
- * @defgroup api-server         Server
+ * @defgroup api-server               Server
  *
  * @}
  *
- * @defgroup api-addons Add-Ons
+ * @defgroup api-addons               Add-Ons
  *
  * @{
  *
- * @defgroup api-channel-manager     Channel Manager
- * @defgroup api-channel-monitor     Channel Monitoring
- * @defgroup api-child-supervision   Child Supervision
- * @defgroup api-coap-group          CoAP
+ * @defgroup api-channel-manager      Channel Manager
+ * @defgroup api-channel-monitor      Channel Monitoring
+ * @defgroup api-child-supervision    Child Supervision
+ * @defgroup api-coap-group           CoAP
  *
  * @{
  *
- * @defgroup api-coap                CoAP
- * @defgroup api-coap-secure         CoAP Secure
+ * @defgroup api-coap                 CoAP
+ * @defgroup api-coap-secure          CoAP Secure
  *
  * @}
  *
- * @defgroup api-cli                 Command Line Interface
- * @defgroup api-crypto              Crypto
- * @defgroup api-entropy             Entropy Source
- * @defgroup api-factory-diagnostics Factory Diagnostics
- * @defgroup api-heap                Heap
- * @defgroup api-jam-detection       Jam Detection
- * @defgroup api-logging             Logging
- * @defgroup api-ncp                 Network Co-Processor
- * @defgroup api-network-time        Network Time Synchronization
- * @defgroup api-random-group        Random Number Generator
+ * @defgroup api-cli                  Command Line Interface
+ * @defgroup api-crypto               Crypto
+ * @defgroup api-entropy              Entropy Source
+ * @defgroup api-factory-diagnostics  Factory Diagnostics
+ * @defgroup api-heap                 Heap
+ * @defgroup api-jam-detection        Jam Detection
+ * @defgroup api-logging              Logging
+ * @defgroup api-ncp                  Network Co-Processor
+ * @defgroup api-network-time         Network Time Synchronization
+ * @defgroup api-random-group         Random Number Generator
  *
  * @{
  *
- * @defgroup api-random-crypto       RNG Cryptographic
- * @defgroup api-random-non-crypto   RNG Non-cryptographic
+ * @defgroup api-random-crypto        RNG Cryptographic
+ * @defgroup api-random-non-crypto    RNG Non-cryptographic
  *
  * @}
  *
- * @defgroup api-sntp                SNTP
+ * @defgroup api-sntp                 SNTP
  *
  * @}
  *
@@ -137,7 +138,7 @@
  */
 
 /**
- * @defgroup platform  Platform Abstraction
+ * @defgroup platform                 Platform Abstraction
  * @brief
  *   This module includes the platform abstraction used by the OpenThread stack.
  *
@@ -151,6 +152,7 @@
  * @defgroup plat-memory              Memory
  * @defgroup plat-messagepool         Message Pool
  * @defgroup plat-misc                Miscellaneous
+ * @defgroup plat-otns                Network Simulator
  * @defgroup plat-radio               Radio
  * @defgroup plat-settings            Settings
  * @defgroup plat-spi-slave           SPI Slave