diff --git a/spring-oxm/spring-oxm.gradle b/spring-oxm/spring-oxm.gradle
index 1ddbace2020..6ff0412367c 100644
--- a/spring-oxm/spring-oxm.gradle
+++ b/spring-oxm/spring-oxm.gradle
@@ -28,8 +28,10 @@ dependencies {
 	testRuntimeOnly("com.sun.xml.bind:jaxb-impl")
 }
 
-// XJC plugin adds generated code to main source set, but we need it only for tests
+// The XJC plugin adds generated code to the main source set, but we need it only for tests.
+// 1) Reset main source sets to the standard directories only.
 sourceSets.main.java.setSrcDirs(["src/main/java"])
 sourceSets.main.resources.setSrcDirs(["src/main/resources"])
+// 2) Attach XJC output only to the test source sets via lazy providers.
 sourceSets.test.java.srcDir(tasks.named("xjc", XjcTask).flatMap { it.outputJavaDir })
 sourceSets.test.resources.srcDir(tasks.named("xjc", XjcTask).flatMap { it.outputResourcesDir })