diff --git a/build.gradle b/build.gradle
index bb335a00..22c96123 100644
--- a/build.gradle
+++ b/build.gradle
@@ -92,7 +92,7 @@ subprojects { subproject ->
 		scalaVersion = '2.12'
 		springRetryVersion = '1.2.4.RELEASE'
 		springVersion = '5.2.0.M2'
-		springDataCommonsVersion = '2.2.0.M4'
+		springDataCommonsVersion = '2.2.0.RC1'
 		reactorVersion = '3.3.0.M2'
 		reactorKafkaVersion = '1.1.1.RELEASE'
 
diff --git a/samples/sample-04/kafka-4-reactor/HELP.md b/samples/sample-04/kafka-4-reactor/HELP.md
new file mode 100644
index 00000000..322216bf
--- /dev/null
+++ b/samples/sample-04/kafka-4-reactor/HELP.md
@@ -0,0 +1,7 @@
+# Getting Started
+
+### Reference Documentation
+For further reference, please consider the following sections:
+
+* [Official Apache Maven documentation](https://maven.apache.org/guides/index.html)
+