spring-projectsGH-427: Fix randomExpression javadoc

src/main/java/org/springframework/retry/annotation/Backoff.java

@@ -41,6 +41,7 @@
  *
  * @author Dave Syer
  * @author Gary Russell
+ * @author Aftab Shaikh
  * @since 1.1
  *
  */
@@ -130,7 +131,10 @@
 	 * this to true to have the backoff delays randomized, so that the maximum delay is
 	 * multiplier times the previous delay and the distribution is uniform between the two
 	 * values. Use {@code #{...}} for one-time evaluation during initialization, omit the
-	 * delimiters for evaluation at runtime.
+	 * delimiters for evaluation at runtime. This expression is evaluated at configuration
+	 * phase. If it returns true and ({@link #multiplier()} > 1.0) then
+	 * {@link org.springframework.retry.backoff.ExponentialRandomBackOffPolicy} is created
+	 * else {@link org.springframework.retry.backoff.ExponentialBackOffPolicy} is created
 	 * @return the flag to signal randomization is required (default false)
 	 */
 	String randomExpression() default "";