diff --git a/api/rest/client/client.go b/api/rest/client/client.go
index 74725732..4c950ba8 100644
--- a/api/rest/client/client.go
+++ b/api/rest/client/client.go
@@ -131,7 +131,7 @@ func (c *Client) setupHTTPClient() error {
 		var prot ipnet.Protector
 		if c.config.ProtectorKey != nil && len(c.config.ProtectorKey) > 0 {
 			if len(c.config.ProtectorKey) != 32 {
-				return errors.New("Length of ProtectorKey should be 32")
+				return errors.New("length of ProtectorKey should be 32")
 			}
 			var key [32]byte
 			copy(key[:], c.config.ProtectorKey)
diff --git a/api/rest/restapi.go b/api/rest/restapi.go
index ded4cf41..840eec0a 100644
--- a/api/rest/restapi.go
+++ b/api/rest/restapi.go
@@ -40,11 +40,11 @@ var (
 	// ErrNoEndpointEnabled is returned when the API is created but
 	// no HTTPListenAddr, nor libp2p configuration fields, nor a libp2p
 	// Host are provided.
-	ErrNoEndpointsEnabled = errors.New("Neither the libp2p nor the HTTP endpoints are enabled")
+	ErrNoEndpointsEnabled = errors.New("neither the libp2p nor the HTTP endpoints are enabled")
 
 	// ErrHTTPEndpointNotEnabled is returned when trying to perform
 	// operations that rely on the HTTPEndpoint but it is disabled.
-	ErrHTTPEndpointNotEnabled = errors.New("The HTTP endpoint is not enabled")
+	ErrHTTPEndpointNotEnabled = errors.New("the HTTP endpoint is not enabled")
 )
 
 // API implements an API and aims to provides