diff --git a/eventsourcingdb/src/main/java/io/thenativeweb/eventsourcingdb/Precondition.java b/eventsourcingdb/src/main/java/io/thenativeweb/eventsourcingdb/Precondition.java
index 7b76f36..7d18cb7 100644
--- a/eventsourcingdb/src/main/java/io/thenativeweb/eventsourcingdb/Precondition.java
+++ b/eventsourcingdb/src/main/java/io/thenativeweb/eventsourcingdb/Precondition.java
@@ -2,7 +2,10 @@
 
 /**
  * A condition that must hold for {@link Client#writeEvents(java.util.List, java.util.List)} to write events. If any of
- * the preconditions does not hold, no event is written, and the server answers with status code 409.
+ * the preconditions does not hold, no event is written, and the client throws a {@link DbApiException} with the code
+ * {@link ErrorCode#PRECONDITION_VIOLATED}, whichever API the server offers. A recursive precondition needs the v2 API,
+ * though: against a server without it, the client throws an {@link IncompatibleServerException} instead, and sends no
+ * write at all (see {@link PreconditionOptions}).
  */
 public sealed interface Precondition
         permits IsSubjectPristinePrecondition,