Documentation: siteTitle

Change-Id: I7530df1a9131344a86d6945488a6af2180e5e0b6

Documentation/config.md

diff --git a/Documentation/config.md b/Documentation/config.md
index 9cbd132..d5243ac 100644
--- a/Documentation/config.md
+++ b/Documentation/config.md
@@ -7,6 +7,15 @@
 
 ## Core configuration
 
+### Site Title
+
+The title of the site. Default: `Gitiles`.
+
+```
+[gitiles]
+  siteTitle = Acme Inc. Git Browser
+```
+
 ### Fixed time zone
 
 By default dates are formatted including the local user time zone as that