--- old/src/share/vm/runtime/commandLineFlagConstraintsGC.cpp	2016-04-01 13:46:33.528748498 -0700
+++ new/src/share/vm/runtime/commandLineFlagConstraintsGC.cpp	2016-04-01 13:46:33.396748503 -0700
@@ -486,7 +486,8 @@
     if (value > bitmap_size) {
       CommandLineError::print(verbose,
                               "CMSBitMapYieldQuantum (" SIZE_FORMAT ") must "
-                              "be less than or equal to bitmap size (" SIZE_FORMAT ")\n",
+                              "be less than or equal to bitmap size (" SIZE_FORMAT ") "
+                              "whose size corresponds to the size of old generation of the Java heap\n",
                               value, bitmap_size);
       return Flag::VIOLATES_CONSTRAINT;
     }