--- old/src/share/vm/runtime/globals.hpp	2016-02-05 17:10:39.965438182 +0100
+++ new/src/share/vm/runtime/globals.hpp	2016-02-05 17:10:39.867435291 +0100
@@ -2012,11 +2012,14 @@
           range(min_intx, 100)                                              \
                                                                             \
   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
-          "Percentage of the (entire) heap occupancy to start a "           \
-          "concurrent GC cycle. It is used by GCs that trigger a "          \
-          "concurrent GC cycle based on the occupancy of the entire heap, " \
-          "not just one of the generations (e.g., G1). A value of 0 "       \
-          "denotes 'do constant GC cycles'.")                               \
+          "Percentage of the old gen heap occupancy to start a concurrent " \
+          "GC cycle (IHOP) at the end of the next GC. "                     \
+          "If the IHOP value is determined adaptively by the collector, "   \
+          "this value is used as the initial value while there is not "     \
+          "enough information to do the adaptive sizing. Otherwise this "   \
+          "value is fixed. In this case, setting a value of 0 causes "      \
+          "concurrent marking to run as much as possible. "                 \
+          "Used in the G1 collector only.")                                 \
           range(0, 100)                                                     \
                                                                             \
   manageable(intx, CMSTriggerInterval, -1,                                  \