diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/RegionServerObserver.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/RegionServerObserver.java
index b1b94ff918e..69b033032e2 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/RegionServerObserver.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/RegionServerObserver.java
@@ -23,12 +23,21 @@ import java.util.List;
 
 import org.apache.hadoop.hbase.CellScanner;
 import org.apache.hadoop.hbase.Coprocessor;
+import org.apache.hadoop.hbase.HBaseInterfaceAudience;
 import org.apache.hadoop.hbase.MetaMutationAnnotation;
+import org.apache.hadoop.hbase.classification.InterfaceAudience;
+import org.apache.hadoop.hbase.classification.InterfaceStability;
 import org.apache.hadoop.hbase.client.Mutation;
 import org.apache.hadoop.hbase.protobuf.generated.AdminProtos.WALEntry;
 import org.apache.hadoop.hbase.regionserver.Region;
 import org.apache.hadoop.hbase.replication.ReplicationEndpoint;
 
+/**
+ * Defines coprocessor hooks for interacting with operations on the
+ * {@link org.apache.hadoop.hbase.regionserver.HRegionServer} process.
+ */
+@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.COPROC)
+@InterfaceStability.Evolving
 public interface RegionServerObserver extends Coprocessor {
 
   /**
@@ -69,7 +78,7 @@ public interface RegionServerObserver extends Coprocessor {
    * @param ctx
    * @param regionA
    * @param regionB
-   * @param metaEntries mutations to execute on hbase:meta atomically with regions merge updates. 
+   * @param metaEntries mutations to execute on hbase:meta atomically with regions merge updates.
    *        Any puts or deletes to execute on hbase:meta can be added to the mutations.
    * @throws IOException
    */