--- a/jdk/src/share/classes/java/time/YearMonth.java	Wed May 15 15:01:59 2013 +0100
+++ b/jdk/src/share/classes/java/time/YearMonth.java	Wed May 15 07:48:57 2013 -0700
@@ -110,7 +110,7 @@
  * However, any application that makes use of historical dates, and requires them
  * to be accurate will find the ISO-8601 approach unsuitable.
  *
- * <h3>Specification for implementors</h3>
+ * @implSpec
  * This class is immutable and thread-safe.
  *
  * @since 1.8
@@ -944,10 +944,10 @@
     }
 
     /**
-     * Calculates the period between this year-month and another year-month in
-     * terms of the specified unit.
+     * Calculates the amount of time until another year-month in terms of the specified unit.
      * <p>
-     * This calculates the period between two year-months in terms of a single unit.
+     * This calculates the amount of time between two {@code YearMonth}
+     * objects in terms of a single {@code TemporalUnit}.
      * The start and end points are {@code this} and the specified year-month.
      * The result will be negative if the end is before the start.
      * The {@code Temporal} passed to this method must be a {@code YearMonth}.
@@ -982,9 +982,9 @@
      * This instance is immutable and unaffected by this method call.
      *
      * @param endYearMonth  the end year-month, which must be a {@code YearMonth}, not null
-     * @param unit  the unit to measure the period in, not null
-     * @return the amount of the period between this year-month and the end year-month
-     * @throws DateTimeException if the period cannot be calculated
+     * @param unit  the unit to measure the amount in, not null
+     * @return the amount of time between this year-month and the end year-month
+     * @throws DateTimeException if the amount cannot be calculated
      * @throws UnsupportedTemporalTypeException if the unit is not supported
      * @throws ArithmeticException if numeric overflow occurs
      */
@@ -992,7 +992,7 @@
     public long periodUntil(Temporal endYearMonth, TemporalUnit unit) {
         if (endYearMonth instanceof YearMonth == false) {
             Objects.requireNonNull(endYearMonth, "endYearMonth");
-            throw new DateTimeException("Unable to calculate period between objects of two different types");
+            throw new DateTimeException("Unable to calculate amount as objects are of two different types");
         }
         YearMonth end = (YearMonth) endYearMonth;
         if (unit instanceof ChronoUnit) {