Update patch-management.md

wagov · Aug 29, 2023 · d229584 · d229584
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 # Patch Management Guideline
 
-This guideline is intended to define a pragmatic target for effective patch management and associated tools for most use cases.
+This guideline is intended to define a pragmatic target for effective patch management and associated tools for most use cases. This guide is primarily focused on routine patching as defined within [NIST Special Publication 800-40r4](https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-40r4.pdf) (Guide to Enterprise Patch Management Planning: Preventive Maintenance for Technology).
 
 ## Small / hybrid scenarios