From f7a9d2e66ed71a4e3bfaa24380e84bf465d665a8 Mon Sep 17 00:00:00 2001
From: Dave Grijalva <grijalva@gmail.com>
Date: Sat, 28 Jun 2014 11:31:26 -0700
Subject: [PATCH] documentation about key requirements

---
 rs256.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/rs256.go b/rs256.go
index 271f5df..05f24c4 100644
--- a/rs256.go
+++ b/rs256.go
@@ -51,6 +51,8 @@ func (m *SigningMethodRS256) Verify(signingString, signature string, key []byte)
 	return
 }
 
+// Implements the Sign method from SigningMethod
+// For this signing method, must be PEM encoded PKCS1 or PKCS8 RSA private key
 func (m *SigningMethodRS256) Sign(signingString string, key []byte) (sig string, err error) {
 	// Key
 	var rsaKey *rsa.PrivateKey