diff --git a/sdk/servicebus/service-bus/src/serviceBusClient.ts b/sdk/servicebus/service-bus/src/serviceBusClient.ts
index 002c34c9150c..c0cc55577610 100644
--- a/sdk/servicebus/service-bus/src/serviceBusClient.ts
+++ b/sdk/servicebus/service-bus/src/serviceBusClient.ts
@@ -79,25 +79,53 @@ export class ServiceBusClient {
   }
 
   /**
-   * Creates a receiver for an Azure Service Bus queue.
+   * Creates a receiver for an Azure Service Bus queue in peekLock mode.
+   *
+   * In peekLock mode, the receiver has a lock on the message for the duration specified on the
+   * queue.
+   *
+   * Messages that are not settled within the lock duration will be redelivered as many times as
+   * the max delivery count set on the queue, after which they get sent to a separate dead letter
+   * queue.
+   *
+   * You can settle a message by calling complete(), abandon(), defer() or deadletter() methods on
+   * the message.
+   * 
+   * More information about how peekLock and message settlement works here:
+   * https://docs.microsoft.com/en-us/azure/service-bus-messaging/message-transfers-locks-settlement#peeklock
    *
    * @param queueName The name of the queue to receive from.
-   * @param receiveMode The receive mode to use (defaults to PeekLock)
+   * @param receiveMode The receive mode, defaulted to peekLock.
    */
   createReceiver(queueName: string, receiveMode: "peekLock"): Receiver<ReceivedMessageWithLock>;
   /**
-   * Creates a receiver for an Azure Service Bus queue.
+   * Creates a receiver for an Azure Service Bus queue in receiveAndDelete mode.
+   *
+   * In receiveAndDelete mode, messages are deleted from Service Bus as they are received.
    *
    * @param queueName The name of the queue to receive from.
-   * @param receiveMode The receive mode to use (defaults to PeekLock)
+   * @param receiveMode The receive mode, defaulted to receiveAndDelete.
    */
   createReceiver(queueName: string, receiveMode: "receiveAndDelete"): Receiver<ReceivedMessage>;
   /**
-   * Creates a receiver for an Azure Service Bus subscription.
+   * Creates a receiver for an Azure Service Bus subscription in peekLock mode.
+   *
+   * In peekLock mode, the receiver has a lock on the message for the duration specified on the
+   * subscription.
+   *
+   * Messages that are not settled within the lock duration will be redelivered as many times as
+   * the max delivery count set on the subscription, after which they get sent to a separate dead letter
+   * queue.
+   *
+   * You can settle a message by calling complete(), abandon(), defer() or deadletter() methods on
+   * the message.
+   * 
+   * More information about how peekLock and message settlement works here:
+   * https://docs.microsoft.com/en-us/azure/service-bus-messaging/message-transfers-locks-settlement#peeklock
    *
    * @param topicName Name of the topic for the subscription we want to receive from.
    * @param subscriptionName Name of the subscription (under the `topic`) that we want to receive from.
-   * @param receiveMode The receive mode to use (defaults to PeekLock)
+   * @param receiveMode The receive mode, defaulted to peekLock.
    */
   createReceiver(
     topicName: string,
@@ -105,11 +133,13 @@ export class ServiceBusClient {
     receiveMode: "peekLock"
   ): Receiver<ReceivedMessageWithLock>;
   /**
-   * Creates a receiver for an Azure Service Bus subscription.
+   * Creates a receiver for an Azure Service Bus subscription in receiveAndDelete mode.
+   *
+   * In receiveAndDelete mode, messages are deleted from Service Bus as they are received.
    *
    * @param topicName Name of the topic for the subscription we want to receive from.
    * @param subscriptionName Name of the subscription (under the `topic`) that we want to receive from.
-   * @param receiveMode The receive mode to use (defaults to PeekLock)
+   * @param receiveMode The receive mode, defaulted to receiveAndDelete.
    */
   createReceiver(
     topicName: string,
@@ -152,10 +182,23 @@ export class ServiceBusClient {
   }
 
   /**
-   * Creates a receiver for an Azure Service Bus queue.
+   * Creates a receiver for a session enabled Azure Service Bus queue in peekLock mode.
+   *
+   * In peekLock mode, the receiver has a lock on the session for the duration specified on the
+   * queue.
+   *
+   * Messages that are not settled within the lock duration will be redelivered as many times as
+   * the max delivery count set on the queue, after which they get sent to a separate dead letter
+   * queue.
+   *
+   * You can settle a message by calling complete(), abandon(), defer() or deadletter() methods on
+   * the message.
+   * 
+   * More information about how peekLock and message settlement works here:
+   * https://docs.microsoft.com/en-us/azure/service-bus-messaging/message-transfers-locks-settlement#peeklock
    *
    * @param queueName The name of the queue to receive from.
-   * @param receiveMode The receive mode to use (defaults to PeekLock)
+   * @param receiveMode The receive mode, defaulted to peekLock.
    * @param options Options for the receiver itself.
    */
   createSessionReceiver(
@@ -164,10 +207,12 @@ export class ServiceBusClient {
     options?: CreateSessionReceiverOptions
   ): Promise<SessionReceiver<ReceivedMessageWithLock>>;
   /**
-   * Creates a receiver for an Azure Service Bus queue.
+   * Creates a receiver for a session enabled Azure Service Bus queue in receiveAndDelete mode.
+   *
+   * In receiveAndDelete mode, messages are deleted from Service Bus as they are received.
    *
    * @param queueName The name of the queue to receive from.
-   * @param receiveMode The receive mode to use (defaults to PeekLock)
+   * @param receiveMode The receive mode, defaulted to receiveAndDelete.
    * @param options Options for the receiver itself.
    */
   createSessionReceiver(
@@ -176,11 +221,24 @@ export class ServiceBusClient {
     options?: CreateSessionReceiverOptions
   ): Promise<SessionReceiver<ReceivedMessage>>;
   /**
-   * Creates a receiver for an Azure Service Bus subscription.
+   * Creates a receiver for a session enabled Azure Service Bus subscription in peekLock mode.
+   *
+   * In peekLock mode, the receiver has a lock on the session for the duration specified on the
+   * subscription.
+   *
+   * Messages that are not settled within the lock duration will be redelivered as many times as
+   * the max delivery count set on the subscription, after which they get sent to a separate dead letter
+   * queue.
+   *
+   * You can settle a message by calling complete(), abandon(), defer() or deadletter() methods on
+   * the message.
+   * 
+   * More information about how peekLock and message settlement works here:
+   * https://docs.microsoft.com/en-us/azure/service-bus-messaging/message-transfers-locks-settlement#peeklock
    *
    * @param topicName Name of the topic for the subscription we want to receive from.
    * @param subscriptionName Name of the subscription (under the `topic`) that we want to receive from.
-   * @param receiveMode The receive mode to use (defaults to PeekLock)
+   * @param receiveMode The receive mode, defaulted to peekLock.
    * @param options Options for the receiver itself.
    */
   createSessionReceiver(
@@ -190,11 +248,13 @@ export class ServiceBusClient {
     options?: CreateSessionReceiverOptions
   ): Promise<SessionReceiver<ReceivedMessageWithLock>>;
   /**
-   * Creates a receiver for an Azure Service Bus subscription.
+   * Creates a receiver for a session enabled Azure Service Bus subscription in receiveAndDelete mode.
+   *
+   * In receiveAndDelete mode, messages are deleted from Service Bus as they are received.
    *
    * @param topicName Name of the topic for the subscription we want to receive from.
    * @param subscriptionName Name of the subscription (under the `topic`) that we want to receive from.
-   * @param receiveMode The receive mode to use (defaults to PeekLock)
+   * @param receiveMode The receive mode, defaulted to receiveAndDelete.
    * @param options Options for the receiver itself.
    */
   createSessionReceiver(
@@ -271,31 +331,63 @@ export class ServiceBusClient {
   // }
 
   /**
-   * Creates a receiver for an Azure Service Bus queue's dead letter queue.
+   * Creates a receiver for an Azure Service Bus queue's dead letter queue in peekLock mode.
+   *
+   * In peekLock mode, the receiver has a lock on the message for the duration specified on the
+   * queue.
+   *
+   * In peekLock mode, the receiver has a lock on the message for the duration specified on the
+   * queue. Messages that are not settled within the lock duration will be redelivered.
+   *
+   * You can settle a message by calling complete(), abandon() or defer() methods on
+   * the message.
+   *
+   * See here for more information about dead letter queues:
+   * https://docs.microsoft.com/en-us/azure/service-bus-messaging/service-bus-dead-letter-queues
+   * 
+   * More information about how peekLock and message settlement works here:
+   * https://docs.microsoft.com/en-us/azure/service-bus-messaging/message-transfers-locks-settlement#peeklock
    *
    * @param queueName The name of the queue to receive from.
-   * @param receiveMode The receive mode to use (defaults to PeekLock)
+   * @param receiveMode The receive mode, defaulted to peekLock.
    */
   createDeadLetterReceiver(
     queueName: string,
     receiveMode: "peekLock"
   ): Receiver<ReceivedMessageWithLock>;
   /**
-   * Creates a receiver for an Azure Service Bus queue's dead letter queue.
+   * Creates a receiver for an Azure Service Bus queue's dead letter queue in receiveAndDelete mode.
+   *
+   * In receiveAndDelete mode, messages are deleted from Service Bus as they are received.
+   *
+   * See here for more information about dead letter queues:
+   * https://docs.microsoft.com/en-us/azure/service-bus-messaging/service-bus-dead-letter-queues
    *
    * @param queueName The name of the queue to receive from.
-   * @param receiveMode The receive mode to use (defaults to PeekLock)
+   * @param receiveMode The receive mode, defaulted to receiveAndDelete.
    */
   createDeadLetterReceiver(
     queueName: string,
     receiveMode: "receiveAndDelete"
   ): Receiver<ReceivedMessage>;
   /**
-   * Creates a receiver for an Azure Service Bus subscription's dead letter queue.
+   * Creates a receiver for an Azure Service Bus subscription's dead letter queue in peekLock mode.
+   *
+   * In peekLock mode, the receiver has a lock on the message for the duration specified on the
+   * subscription. Messages that are not settled within the lock duration will be redelivered.
+   *
+   * You can settle a message by calling complete(), abandon() or defer() methods on
+   * the message.
+   *
+   * See here for more information about dead letter queues:
+   * https://docs.microsoft.com/en-us/azure/service-bus-messaging/service-bus-dead-letter-queues
+   * 
+   * More information about how peekLock and message settlement works here:
+   * https://docs.microsoft.com/en-us/azure/service-bus-messaging/message-transfers-locks-settlement#peeklock
    *
    * @param topicName Name of the topic for the subscription we want to receive from.
    * @param subscriptionName Name of the subscription (under the `topic`) that we want to receive from.
-   * @param receiveMode The receive mode to use (defaults to PeekLock)
+   * @param receiveMode The receive mode, defaulted to peekLock.
    */
   createDeadLetterReceiver(
     topicName: string,
@@ -303,11 +395,16 @@ export class ServiceBusClient {
     receiveMode: "peekLock"
   ): Receiver<ReceivedMessageWithLock>;
   /**
-   * Creates a receiver for an Azure Service Bus subscription's dead letter queue.
+   * Creates a receiver for an Azure Service Bus subscription's dead letter queue in receiveAndDelete mode.
+   *
+   * In receiveAndDelete mode, messages are deleted from Service Bus as they are received.
+   *
+   * See here for more information about dead letter queues:
+   * https://docs.microsoft.com/en-us/azure/service-bus-messaging/service-bus-dead-letter-queues
    *
    * @param topicName Name of the topic for the subscription we want to receive from.
    * @param subscriptionName Name of the subscription (under the `topic`) that we want to receive from.
-   * @param receiveMode The receive mode to use (defaults to PeekLock)
+   * @param receiveMode The receive mode, defaulted to receiveAndDelete.
    */
   createDeadLetterReceiver(
     topicName: string,