Update README.md

skion · skion · commit 8ea7895d3296 · 2014-10-21T21:47:35.000+01:00
diff --git a/README.md b/README.md
@@ -77,6 +77,7 @@ JSON Web Token defines some reserved claim names and defines how they should be
 used. PyJWT supports these reserved claim names:
 
  - "exp" (Expiration Time) Claim
+ - "nbf" (Not Before Time) Claim
 
 ### Expiration Time Claim
 
