diff --git a/chain/sync.go b/chain/sync.go
index fbd497644e5..eb8a3db04c1 100644
--- a/chain/sync.go
+++ b/chain/sync.go
@@ -817,7 +817,7 @@ loop:
 		// FIXME: The reassembly logic should be part of the `client`
 		//  service, the consumer should not be concerned with the
 		//  `MaxRequestLength` limitation, it should just be able to request
-		//  an segment of arbitrary length. The same burden is put on
+		//  a segment of arbitrary length. The same burden is put on
 		//  `syncFork()` which needs to be aware this as well.
 		if blockSet[len(blockSet)-1].IsChildOf(blks[0]) == false {
 			return nil, xerrors.Errorf("retrieved segments of the chain are not connected at heights %d/%d",
diff --git a/cmd/lotus-shed/miner-multisig.go b/cmd/lotus-shed/miner-multisig.go
index 1aa6e80dd4f..de1df6c5ac6 100644
--- a/cmd/lotus-shed/miner-multisig.go
+++ b/cmd/lotus-shed/miner-multisig.go
@@ -375,7 +375,7 @@ var mmApproveChangeOwner = &cli.Command{
 
 var mmProposeChangeWorker = &cli.Command{
 	Name:      "propose-change-worker",
-	Usage:     "Propose an worker address change",
+	Usage:     "Propose a worker address change",
 	ArgsUsage: "[newWorker]",
 	Action: func(cctx *cli.Context) error {
 		if !cctx.Args().Present() {
@@ -580,7 +580,7 @@ var mmProposeChangeBeneficiary = &cli.Command{
 
 var mmConfirmChangeWorker = &cli.Command{
 	Name:      "confirm-change-worker",
-	Usage:     "Confirm an worker address change",
+	Usage:     "Confirm a worker address change",
 	ArgsUsage: "[newWorker]",
 	Action: func(cctx *cli.Context) error {
 		if !cctx.Args().Present() {
diff --git a/storage/sealer/worker_local.go b/storage/sealer/worker_local.go
index 9f9e4939d39..1d017717e58 100644
--- a/storage/sealer/worker_local.go
+++ b/storage/sealer/worker_local.go
@@ -714,7 +714,7 @@ func (l *LocalWorker) GenerateWindowPoStAdv(ctx context.Context, ppt abi.Registe
 		// When it does happen, window post runner logic will just re-check sectors, and retry with newly-discovered-bad sectors skipped
 		log.Errorf("couldn't read some challenges (skipped %d)", len(skipped))
 
-		// note: can't return an error as this in an jsonrpc call
+		// note: can't return an error as this in a jsonrpc call
 		return storiface.WindowPoStResult{Skipped: skipped}, nil
 	}