added TALK_CONCURRENCY to adv config

docs/source/01-04-planning-architecture.md

@@ -49,6 +49,8 @@ When you are ready to launch your production instance of Talk update your NODE_E
 
 Then launch talk with `yarn start` or with the command `NODE_ENV=production ./bin/cli-serve -j -w`
 
+By default Talk will run on a single thread, but you can also run multiple Talk threads on a single application instance by setting the environment variable `TALK_CONCURRENCY`. [See Advanced Configuration](/talk/advanced-configuration/#talk-concurrency)
+
 
 
 

docs/source/02-02-advanced-configuration.md

@@ -23,6 +23,10 @@ otherwise the application will fail to start.
 Configure the duration for which comment counts are cached for, parsed by
 [ms](https://www.npmjs.com/package/ms). (Default `1hr`)
 
+## TALK_CONCURRENCY
+
+This environment variable allows multiple worker processes to be spawned to handle traffic. Defaults to 1 if not set. 
+
 ## TALK_DEFAULT_LANG
 
 This is a **Build Variable** and must be consumed during build. If using the