diff --git a/guava/src/com/google/common/collect/ImmutableTable.java b/guava/src/com/google/common/collect/ImmutableTable.java
index 16bce6a8cf37..b4aa9582cc39 100644
--- a/guava/src/com/google/common/collect/ImmutableTable.java
+++ b/guava/src/com/google/common/collect/ImmutableTable.java
@@ -18,6 +18,7 @@
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 import com.google.common.base.MoreObjects;
 import com.google.common.collect.Tables.AbstractCell;
@@ -59,6 +60,7 @@ public abstract class ImmutableTable<R, C, V> extends AbstractTable<R, C, V>
    *
    * @since 21.0
    */
+  @Beta
   public static <T, R, C, V> Collector<T, ?, ImmutableTable<R, C, V>> toImmutableTable(
       Function<? super T, ? extends R> rowFunction,
       Function<? super T, ? extends C> columnFunction,