Update configuration.md

content/en/getting-started/configuration.md

@@ -265,6 +265,9 @@ timeout (10000)
 title ("")
 : Site title.
 
+titleCaseStyle ("AP")
+: See [Configure Title Case](#configure-title-case)
+
 uglyURLs (false)
 : When enabled, creates URL of the form `/filename.html` instead of `/filename/`.
 
@@ -291,6 +294,10 @@ enableemoji: true
 ```
 {{% /note %}}
 
+## Configure Title Case
+
+Set `titleCaseStyle` to specify the title style used by the [title](/functions/title/) template function and the automatic section titles in Hugo. It defaults to [AP Stylebook](https://www.apstylebook.com/) for title casing, but you can also set it to `Chicago` or `Go` (every word starts with a capital letter).
+
 ## Configuration Environment Variables
 
 HUGO_NUMWORKERMULTIPLIER