diff --git a/partitioning-samples/README.adoc b/partitioning-samples/README.adoc
index ee7ddf0..80dfc22 100644
--- a/partitioning-samples/README.adoc
+++ b/partitioning-samples/README.adoc
@@ -6,7 +6,8 @@ This is a collection of applications that demonstrates how partitioning works in
 ## Quick introduction
 
 The producer used in the sample produces messages with text that has a length of 1, 2, 3 or 4.
-There is a configuration in the producer's application.yml file for `partition-key-expression` that uses the length of the payload minus 1 as the partition to use.
+There is a configuration in the producer's application.yml file for `partition-key-expression` that uses the length of the payload minus 1 as the partition key expression to use.
+This value will be used by the binder for selecting the correct partition based on the total number of partitions configured on the destination at the broker.
 We use 4 partitions for this demo.
 
 There is a common producer module called partitioning-producer and then there is a consumer for kafka and rabbit - partitioning-consumer-kafka and partitioning-consumer-rabbit respectively.