diff --git a/cadc-download-manager/build.gradle b/cadc-download-manager/build.gradle
index e10077a..6569a3c 100644
--- a/cadc-download-manager/build.gradle
+++ b/cadc-download-manager/build.gradle
@@ -24,7 +24,11 @@ dependencies {
     implementation 'org.opencadc:cadc-util:[1.6,)'
     implementation 'org.opencadc:cadc-registry:[1.1.1,)'
     implementation 'org.opencadc:cadc-app-kit:[1.0,)'
+
+    // Locking down cadc-vos to a version that is JDK 1.8 compatible.
+    // Use version >= 2.x when JDK 11 is supported.
     implementation 'org.opencadc:cadc-vos:1.2.3'
+
     implementation 'org.opencadc:cadc-dali:[1.2.15,)'
     implementation 'org.opencadc:cadc-datalink:[1.0.0,1.1.0)'
     implementation 'org.opencadc:caom2-artifact-resolvers:[1.2.10,1.3.0)'