diff --git a/core/src/main/java/io/grpc/ManagedChannel.java b/core/src/main/java/io/grpc/ManagedChannel.java
index 38085dc27f..7875fdb57f 100644
--- a/core/src/main/java/io/grpc/ManagedChannel.java
+++ b/core/src/main/java/io/grpc/ManagedChannel.java
@@ -73,6 +73,8 @@ public abstract class ManagedChannel extends Channel {
   /**
    * Gets the current connectivity state. Note the result may soon become outdated.
    *
+   * <p>Note that the core library did not provide an implementation of this method until v1.6.1.
+   *
    * @param requestConnection if {@code true}, the channel will try to make a connection if it is
    *        currently IDLE
    * @throws UnsupportedOperationException if not supported by implementation
@@ -96,6 +98,8 @@ public abstract class ManagedChannel extends Channel {
    * states may not have been observed. The API is only reliable in tracking the <em>current</em>
    * state.
    *
+   * <p>Note that the core library did not provide an implementation of this method until v1.6.1.
+   *
    * @param source the assumed current state, typically just returned by {@link #getState}
    * @param callback the one-off callback
    * @throws UnsupportedOperationException if not supported by implementation