Clarify what `null` means
@@ -1157,6 +1157,7 @@ public class UpdateSite {
/**
* Returns the minimum Java version needed to use the plugin and all its dependencies.
* @since TODO
+ * @return the minimum Java version needed to use the plugin and all its dependencies, or null if unspecified.
*/
@CheckForNull
public VersionNumber getNeededDependenciesMinimumJavaVersion() {
