diff --git a/include/openthread/instance.h b/include/openthread/instance.h
index 8c3b4cfee..621bd6cda 100644
--- a/include/openthread/instance.h
+++ b/include/openthread/instance.h
@@ -53,7 +53,7 @@ extern "C" {
  * @note This number versions both OpenThread platform and user APIs.
  *
  */
-#define OPENTHREAD_API_VERSION (135)
+#define OPENTHREAD_API_VERSION (136)
 
 /**
  * @addtogroup api-instance
diff --git a/include/openthread/thread.h b/include/openthread/thread.h
index 8498aa965..b3968ff3f 100644
--- a/include/openthread/thread.h
+++ b/include/openthread/thread.h
@@ -378,11 +378,11 @@ otLinkModeConfig otThreadGetLinkMode(otInstance *aInstance);
 otError otThreadSetLinkMode(otInstance *aInstance, otLinkModeConfig aConfig);
 
 /**
- * Get the thrNetworkKey.
+ * Get the Thread Network Key.
  *
  * @param[in]   aInstance   A pointer to an OpenThread instance.
  *
- * @returns A pointer to a buffer containing the thrNetworkKey.
+ * @returns A pointer to a buffer containing the Thread Network Key.
  *
  * @sa otThreadSetNetworkKey
  *
@@ -390,16 +390,16 @@ otError otThreadSetLinkMode(otInstance *aInstance, otLinkModeConfig aConfig);
 const otNetworkKey *otThreadGetNetworkKey(otInstance *aInstance);
 
 /**
- * Set the thrNetworkKey.
+ * Set the Thread Network Key.
  *
  * This function succeeds only when Thread protocols are disabled.  A successful
  * call to this function invalidates the Active and Pending Operational Datasets in
  * non-volatile memory.
  *
  * @param[in]  aInstance   A pointer to an OpenThread instance.
- * @param[in]  aKey        A pointer to a buffer containing the thrNetworkKey.
+ * @param[in]  aKey        A pointer to a buffer containing the Thread Network Key.
  *
- * @retval OT_ERROR_NONE            Successfully set the thrNetworkKey.
+ * @retval OT_ERROR_NONE            Successfully set the Thread Network Key.
  * @retval OT_ERROR_INVALID_ARGS    If aKeyLength is larger than 16.
  * @retval OT_ERROR_INVALID_STATE   Thread protocols are enabled.
  *