--- old/src/hotspot/share/gc/g1/g1Policy.hpp	2018-11-26 21:52:07.584843402 +0100
+++ new/src/hotspot/share/gc/g1/g1Policy.hpp	2018-11-26 21:52:07.160841300 +0100
@@ -402,11 +402,11 @@
   size_t desired_survivor_size() const;
 public:
   // Fraction used when predicting how many optional regions to include in
-  // the CSet. Use 20% of the available time for optional regions, the rest
-  // is used to add old regions to the normal CSet.
+  // the CSet. This fraction of the available time is used for optional regions,
+  // the rest is used to add old regions to the normal CSet.
   double optional_prediction_fraction() { return 0.2; }
-  // Fraction used when evacuating the optional regions. Use 75% of the
-  // remaining time to choose what regions to include in the evacuation.
+  // Fraction used when evacuating the optional regions. This fraction of the
+  // remaining time is used to choose what regions to include in the evacuation.
   double optional_evacuation_fraction() { return 0.75; }
 
   uint tenuring_threshold() const { return _tenuring_threshold; }