diff --git a/CHANGELOG.md b/CHANGELOG.md
index c4724447b159..548f2ed065ee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -36,6 +36,9 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ## Unreleased
 
+### Improvements
+
+* (cli) [\#9717](https://github.com/cosmos/cosmos-sdk/pull/9717) Added CLI flag `--output json/text` to `tx` cli commands.
 
 ## [v0.42.7](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.42.7) - 2021-07-09
 
diff --git a/client/flags/flags.go b/client/flags/flags.go
index b305412d4667..7d4de556b69c 100644
--- a/client/flags/flags.go
+++ b/client/flags/flags.go
@@ -94,6 +94,7 @@ func AddQueryFlagsToCmd(cmd *cobra.Command) {
 
 // AddTxFlagsToCmd adds common flags to a module tx command.
 func AddTxFlagsToCmd(cmd *cobra.Command) {
+	cmd.Flags().StringP(tmcli.OutputFlag, "o", "json", "Output format (text|json)")
 	cmd.Flags().String(FlagKeyringDir, "", "The client Keyring directory; if omitted, the default 'home' directory will be used")
 	cmd.Flags().String(FlagFrom, "", "Name or address of private key with which to sign")
 	cmd.Flags().Uint64P(FlagAccountNumber, "a", 0, "The account number of the signing account (offline mode only)")