diff --git a/transport/config.go b/transport/config.go
index 0c9ccce2..07047483 100644
--- a/transport/config.go
+++ b/transport/config.go
@@ -108,7 +108,7 @@ func (c *Config) HasCertAuth() bool {
 	return (len(c.TLS.CertData) != 0 || len(c.TLS.CertFile) != 0) && (len(c.TLS.KeyData) != 0 || len(c.TLS.KeyFile) != 0)
 }
 
-// HasCertCallbacks returns whether the configuration has certificate callback or not.
+// HasCertCallback returns whether the configuration has certificate callback or not.
 func (c *Config) HasCertCallback() bool {
 	return c.TLS.GetCert != nil
 }
diff --git a/transport/round_trippers.go b/transport/round_trippers.go
index b198e5db..056bc023 100644
--- a/transport/round_trippers.go
+++ b/transport/round_trippers.go
@@ -146,6 +146,7 @@ type userAgentRoundTripper struct {
 	rt    http.RoundTripper
 }
 
+// NewUserAgentRoundTripper will add User-Agent header to a request unless it has already been set.
 func NewUserAgentRoundTripper(agent string, rt http.RoundTripper) http.RoundTripper {
 	return &userAgentRoundTripper{agent, rt}
 }
@@ -260,7 +261,7 @@ func NewBearerAuthRoundTripper(bearer string, rt http.RoundTripper) http.RoundTr
 	return &bearerAuthRoundTripper{bearer, nil, rt}
 }
 
-// NewBearerAuthRoundTripper adds the provided bearer token to a request
+// NewBearerAuthWithRefreshRoundTripper adds the provided bearer token to a request
 // unless the authorization header has already been set.
 // If tokenFile is non-empty, it is periodically read,
 // and the last successfully read content is used as the bearer token.