Configure descriptive book return links

README.md

@@ -36,10 +36,14 @@ independently validates every link.
 Until generated Ages arrive in Milestone 3, written Descriptive Books resolve
 deterministically to the Overworld, Nether, or End according to their Age UUID.
 The Rivencraft creative tab includes one sample book for each. Linking creates
-a bound Return Link to the exact source position and orientation. Descriptive
+a bound Return Link to the exact source position and orientation on an Age's
+first successful visit. Descriptive
 Book destinations additionally require solid footing beneath the player. If
 their recorded arrival is unsafe, they search nearby terrain for a footed spot.
 
+Server owners can set `descriptive_books.return_link_mode` in Rivencraft's
+server config to `ON_CREATION` (default), `ALWAYS`, or `DISABLED`.
+
 ## Requirements
 
 - A Java 21 JDK