diff --git a/docs/learn/advanced/01-transactions.md b/docs/learn/advanced/01-transactions.md
index 35d319f19b0..f24aa571538 100644
--- a/docs/learn/advanced/01-transactions.md
+++ b/docs/learn/advanced/01-transactions.md
@@ -149,6 +149,8 @@ https://github.com/cosmos/cosmos-sdk/blob/v0.52.0-beta.2/client/tx_config.go#L39
 * `Memo`, a note or comment to send with the transaction.
 * `FeeAmount`, the maximum amount the user is willing to pay in fees.
 * `TimeoutHeight`, block height until which the transaction is valid.
+* `TimeoutTimestamp`, timestamp until which the transaction is valid.
+* `Unordered`, whether transactions can be executed in any order. Nonce is then unevaluated (NOTE: A timeout timestamp must be set if `Unordered` is true).
 * `Signatures`, the array of signatures from all signers of the transaction.
 
 As there are currently two sign modes for signing transactions, there are also two implementations of `TxBuilder`:
diff --git a/x/auth/README.md b/x/auth/README.md
index 4adf48bdb20..dce25b4e10f 100644
--- a/x/auth/README.md
+++ b/x/auth/README.md
@@ -165,7 +165,7 @@ The auth module provides `AnteDecorator`s that are recursively chained together
 
 * `ValidateBasicDecorator`: Calls `tx.ValidateBasic` and returns any non-nil error.
 
-* `TxTimeoutHeightDecorator`: Check for a `tx` height timeout.
+* `TxTimeoutHeightDecorator`: Check for a `tx` height or time-based timeout.
 
 * `ValidateMemoDecorator`: Validates `tx` memo with application parameters and returns any non-nil error.
 
diff --git a/x/auth/ante/basic.go b/x/auth/ante/basic.go
index 3f288460e8f..9b0b15469e5 100644
--- a/x/auth/ante/basic.go
+++ b/x/auth/ante/basic.go
@@ -217,7 +217,7 @@ func isIncompleteSignature(data signing.SignatureData) bool {
 
 type (
 	// TxTimeoutHeightDecorator defines an AnteHandler decorator that checks for a
-	// tx height timeout.
+	// tx height and timestamp timeout.
 	TxTimeoutHeightDecorator struct {
 		env appmodulev2.Environment
 	}
@@ -253,6 +253,8 @@ func (txh TxTimeoutHeightDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, _ boo
 // type where the current block height is checked against the tx's height timeout.
 // If a height timeout is provided (non-zero) and is less than the current block
 // height, then an error is returned.
+// Additionally, if a timestamp timeout is provided and is less than the current
+// block time, then an error is returned.
 func (txh TxTimeoutHeightDecorator) ValidateTx(ctx context.Context, tx sdk.Tx) error {
 	timeoutTx, ok := tx.(TxWithTimeoutHeight)
 	if !ok {