add @since

git-svn-id: https://svn.apache.org/repos/asf/directmemory/trunk@1501727 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/integrations/guava/src/main/java/org/apache/directmemory/guava/ForwardingListener.java b/integrations/guava/src/main/java/org/apache/directmemory/guava/ForwardingListener.java
index a530c40..7b4fd49 100644
--- a/integrations/guava/src/main/java/org/apache/directmemory/guava/ForwardingListener.java
+++ b/integrations/guava/src/main/java/org/apache/directmemory/guava/ForwardingListener.java
@@ -25,6 +25,7 @@
 /**
  * Listener which forwards the notifications to a delegate. It is used to bridge the
  * Guava Cache with DirectMemory CacheService
+ * @since 0.2
  */
 public class ForwardingListener<K, V>
     implements RemovalListener<K, V>
diff --git a/integrations/guava/src/main/java/org/apache/directmemory/guava/OffHeapCache.java b/integrations/guava/src/main/java/org/apache/directmemory/guava/OffHeapCache.java
index d9623df..7ebffc5 100644
--- a/integrations/guava/src/main/java/org/apache/directmemory/guava/OffHeapCache.java
+++ b/integrations/guava/src/main/java/org/apache/directmemory/guava/OffHeapCache.java
@@ -41,6 +41,11 @@
 import static com.google.common.cache.AbstractCache.SimpleStatsCounter;
 import static com.google.common.cache.AbstractCache.StatsCounter;
 
+/**
+ *
+ *
+ * @since 0.2
+ */
 public class OffHeapCache<K, V>
     extends ForwardingCache.SimpleForwardingCache<K, V>
     implements RemovalListener<K, V>