diff --git a/modules/jarjar/build.gradle b/modules/jarjar/build.gradle
index cb8ed84c8e2..abcd228e9ed 100644
--- a/modules/jarjar/build.gradle
+++ b/modules/jarjar/build.gradle
@@ -10,6 +10,7 @@ dependencies {
 
     runtime 'commons-codec:commons-codec:1.5'
 
+    // joda 2.0 moved to using volatile fields for datetime, which hurts performance for facets!
     runtime 'joda-time:joda-time:1.6.2'
     runtime 'org.mvel:mvel2:2.1.Beta5'