Fixed a few javadocs.
diff --git a/core/api/src/main/java/org/onlab/onos/net/SparseAnnotations.java b/core/api/src/main/java/org/onlab/onos/net/SparseAnnotations.java
index 9382119..423bca2 100644
--- a/core/api/src/main/java/org/onlab/onos/net/SparseAnnotations.java
+++ b/core/api/src/main/java/org/onlab/onos/net/SparseAnnotations.java
@@ -3,7 +3,8 @@
 import java.util.Set;
 
 /**
- * Represents an set of simply key/value string annotations.
+ * Represents an set of sparse key/value string annotations capable of carrying
+ * annotation keys tagged for removal.
  */
 public interface SparseAnnotations extends Annotations {