Describe the release in which APIs are tagged as deprecated

Change-Id: I6fd0ebba07bcc45237682e083b59a807a720b4fb
diff --git a/core/api/src/main/java/org/onosproject/net/flow/criteria/OpticalSignalTypeCriterion.java b/core/api/src/main/java/org/onosproject/net/flow/criteria/OpticalSignalTypeCriterion.java
index ecf605f..b712675 100644
--- a/core/api/src/main/java/org/onosproject/net/flow/criteria/OpticalSignalTypeCriterion.java
+++ b/core/api/src/main/java/org/onosproject/net/flow/criteria/OpticalSignalTypeCriterion.java
@@ -22,6 +22,8 @@
 /**
  * Implementation of optical signal type criterion (8 bits unsigned
  * integer).
+ *
+ * @deprecated in Cardinal Release
  */
 @Deprecated
 public final class OpticalSignalTypeCriterion implements Criterion {