--- old/src/share/vm/runtime/globals.hpp	2015-02-06 15:24:53.000000000 +0100
+++ new/src/share/vm/runtime/globals.hpp	2015-02-06 15:24:53.000000000 +0100
@@ -1501,7 +1501,7 @@
                                                                             \
   product(bool, ExplicitGCInvokesConcurrent, false,                         \
           "A System.gc() request invokes a concurrent collection; "         \
-          "(effective only when UseConcMarkSweepGC)")                       \
+          "(effective only when UseConcMarkSweepGC or UseG1GC)")            \
                                                                             \
   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
           "A System.gc() request invokes a concurrent collection and "      \