diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2c05bc1a6211..2f2416c2d54a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -36,6 +36,10 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ## Unreleased
 
+### Client Breaking Changes
+
+* [\#9781](https://github.com/cosmos/cosmos-sdk/pull/9781) Improve`withdraw-all-rewards` UX when broadcast mode `async` or `async` is used.
+
 ## [v0.42.8](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.42.8) - 2021-07-30
 
 ### Features
diff --git a/x/distribution/client/cli/tx.go b/x/distribution/client/cli/tx.go
index d62bcd21fa07..2e6a6eeb3953 100644
--- a/x/distribution/client/cli/tx.go
+++ b/x/distribution/client/cli/tx.go
@@ -24,7 +24,7 @@ var (
 )
 
 const (
-	MaxMessagesPerTxDefault = 5
+	MaxMessagesPerTxDefault = 0
 )
 
 // NewTxCmd returns a root CLI command handler for all x/distribution transaction commands.
@@ -133,11 +133,12 @@ func NewWithdrawAllRewardsCmd() *cobra.Command {
 		Short: "withdraw all delegations rewards for a delegator",
 		Long: strings.TrimSpace(
 			fmt.Sprintf(`Withdraw all rewards for a single delegator.
+Note that if you use this command with --%[2]s=%[3]s or --%[2]s=%[4]s, the %[5]s flag will automatically be set to 0.
 
 Example:
-$ %s tx distribution withdraw-all-rewards --from mykey
+$ %[1]s tx distribution withdraw-all-rewards --from mykey
 `,
-				version.AppName,
+				version.AppName, flags.FlagBroadcastMode, flags.BroadcastSync, flags.BroadcastAsync, FlagMaxMessagesPerTx,
 			),
 		),
 		Args: cobra.NoArgs,
@@ -177,6 +178,11 @@ $ %s tx distribution withdraw-all-rewards --from mykey
 			}
 
 			chunkSize, _ := cmd.Flags().GetInt(FlagMaxMessagesPerTx)
+			if clientCtx.BroadcastMode != flags.BroadcastBlock && chunkSize > 0 {
+				return fmt.Errorf("cannot use broadcast mode %[1]s with %[2]s != 0",
+					clientCtx.BroadcastMode, FlagMaxMessagesPerTx)
+			}
+
 			return newSplitAndApply(tx.GenerateOrBroadcastTxCLI, clientCtx, cmd.Flags(), msgs, chunkSize)
 		},
 	}