diff --git a/ci.hocon b/ci.hocon
index 57e9286e736a9b58b55ba8ff9aed73debcdaae2c..d96fd01f504f0bc43ac62d7bcb1748c314e8cb9a 100644
--- a/ci.hocon
+++ b/ci.hocon
@@ -3,8 +3,9 @@
 # but it provide details on the commands that are used and these should be
 # executable in isolation; see further comments below.
 
+# java 7 is needed by Truffle (for now)
 java7 : {name : oraclejdk, version : "7",    platformspecific: true}
-#java8 : {name : oraclejdk, version : "8u66", platformspecific: true}
+# java 8 must be a jvmci enabled variant
 java8 : {name : labsjdk, version : "8u92-jvmci-0.21", platformspecific: true}
 
 java8Downloads : {