diff --git a/generate_cert.go b/generate_cert.go
index 83f9916..8ee2b59 100644
--- a/generate_cert.go
+++ b/generate_cert.go
@@ -33,7 +33,7 @@ var (
 	validFor   = flag.Duration("duration", 365*24*time.Hour, "Duration that certificate is valid for")
 	isCA       = flag.Bool("ca", false, "whether this cert should be its own Certificate Authority")
 	rsaBits    = flag.Int("rsa-bits", 2048, "Size of RSA key to generate. Ignored if --ecdsa-curve is set")
-	ecdsaCurve = flag.String("ecdsa-curve", "", "ECDSA curve to use to generate a key. Valid values are P224, P256, P384, P521")
+	ecdsaCurve = flag.String("ecdsa-curve", "", "ECDSA curve to use to generate a key. Valid values are P224, P256 (recommended), P384, P521")
 )
 
 func publicKey(priv interface{}) interface{} {