README.md in symmetric-encryption-4.3.3 vs README.md in symmetric-encryption-4.4.0

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 ## Documentation
 
 [Symmetric Encryption Guide](https://encryption.rocketjob.io/)
 
-[Reference Documentation](http://www.rubydoc.info/gems/symmetric-encryption/)
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 ## Rocket Job
 
 Checkout the sister project [Rocket Job](http://rocketjob.io): Ruby's missing batch system.
 
 Fully supports Symmetric Encryption to encrypt data in flight and at rest while running jobs in the background.