diff --git a/modules/core/src/main/java/org/apache/ignite/IgniteCache.java b/modules/core/src/main/java/org/apache/ignite/IgniteCache.java
index 002f2c2..0e59a78 100644
--- a/modules/core/src/main/java/org/apache/ignite/IgniteCache.java
+++ b/modules/core/src/main/java/org/apache/ignite/IgniteCache.java
@@ -61,6 +61,7 @@
 import org.apache.ignite.lang.IgniteBiInClosure;
 import org.apache.ignite.lang.IgniteBiPredicate;
 import org.apache.ignite.lang.IgniteClosure;
+import org.apache.ignite.lang.IgniteExperimental;
 import org.apache.ignite.lang.IgniteFuture;
 import org.apache.ignite.mxbean.CacheMetricsMXBean;
 import org.apache.ignite.transactions.TransactionConcurrency;
@@ -139,6 +140,8 @@
     public IgniteCache<K, V> withPartitionRecover();
 
     /**
+     * <b>This is an experimental API.</b>
+     * <p>
      * Gets an instance of {@code IgniteCache} that will perform backup nodes check on each get attempt.
      * <p>
      * Read Repair means that each backup node will be checked to have the same entry as primary node has,
@@ -185,6 +188,7 @@
      * </ul>
      * @return Cache with explicit consistency check on each read and repair if necessary.
      */
+    @IgniteExperimental
     public IgniteCache<K, V> withReadRepair();
 
     /**
diff --git a/modules/core/src/main/java/org/apache/ignite/events/CacheConsistencyViolationEvent.java b/modules/core/src/main/java/org/apache/ignite/events/CacheConsistencyViolationEvent.java
index 01fee82..b00be51 100644
--- a/modules/core/src/main/java/org/apache/ignite/events/CacheConsistencyViolationEvent.java
+++ b/modules/core/src/main/java/org/apache/ignite/events/CacheConsistencyViolationEvent.java
@@ -20,10 +20,13 @@
 import java.util.Map;
 import java.util.UUID;
 import org.apache.ignite.cluster.ClusterNode;
+import org.apache.ignite.lang.IgniteExperimental;
 
 import static org.apache.ignite.events.EventType.EVT_CONSISTENCY_VIOLATION;
 
 /**
+ * <b>This is an experimental API.</b>
+ * <p>
  * Event indicates a consistency violation.
  * <p>
  * Grid events are used for notification about what happens within the grid. Note that by
@@ -57,6 +60,7 @@
  *
  * @see EventType#EVT_CONSISTENCY_VIOLATION
  */
+@IgniteExperimental
 public class CacheConsistencyViolationEvent<K, V> extends EventAdapter {
     /** Serial version UID. */
     private static final long serialVersionUID = 0L;
diff --git a/modules/core/src/main/java/org/apache/ignite/lang/IgniteExperimental.java b/modules/core/src/main/java/org/apache/ignite/lang/IgniteExperimental.java
new file mode 100644
index 0000000..5134ccd
--- /dev/null
+++ b/modules/core/src/main/java/org/apache/ignite/lang/IgniteExperimental.java
@@ -0,0 +1,37 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.lang;
+
+import java.lang.annotation.Target;
+
+import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
+import static java.lang.annotation.ElementType.METHOD;
+import static java.lang.annotation.ElementType.PACKAGE;
+import static java.lang.annotation.ElementType.TYPE;
+
+/**
+ * This annotation marks API elements (such as interfaces, methods, annotations and whole API packages) as experimental
+ * meaning that the API is not finalized yet and may be changed or replaced in future Ignite releases.
+ * <p>
+ * Such APIs are exposed so that users can make use of a feature before the API has been stabilized. The expectation is
+ * that an API element should be "eventually" stabilized. Incompatible changes are allowed for such APIs: API may be
+ * removed, changed or stabilized in future Ignite releases (both minor and maintenance).
+ */
+@Target(value = {TYPE, METHOD, ANNOTATION_TYPE, PACKAGE})
+public @interface IgniteExperimental {
+}
diff --git a/modules/platforms/dotnet/Apache.Ignite.Core/Apache.Ignite.Core.csproj b/modules/platforms/dotnet/Apache.Ignite.Core/Apache.Ignite.Core.csproj
index 1c6d93f..5f7184c 100644
--- a/modules/platforms/dotnet/Apache.Ignite.Core/Apache.Ignite.Core.csproj
+++ b/modules/platforms/dotnet/Apache.Ignite.Core/Apache.Ignite.Core.csproj
@@ -256,6 +256,7 @@
     <Compile Include="Cluster\IClusterNode.cs" />
     <Compile Include="Cluster\IClusterNodeFilter.cs" />
     <Compile Include="Common\IgniteException.cs" />
+    <Compile Include="Common\IgniteExperimentalAttribute.cs" />
     <Compile Include="Common\IgniteFutureCancelledException.cs" />
     <Compile Include="Common\IgniteGuid.cs" />
     <Compile Include="Impl\Binary\Io\IBinaryStreamProcessor.cs" />
diff --git a/modules/platforms/dotnet/Apache.Ignite.Core/Common/IgniteExperimentalAttribute.cs b/modules/platforms/dotnet/Apache.Ignite.Core/Common/IgniteExperimentalAttribute.cs
new file mode 100644
index 0000000..ea82804
--- /dev/null
+++ b/modules/platforms/dotnet/Apache.Ignite.Core/Common/IgniteExperimentalAttribute.cs
@@ -0,0 +1,36 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+namespace Apache.Ignite.Core.Common
+{
+    using System;
+
+    /// <summary>
+    /// This attribute marks API elements (such as interfaces and methods) as experimental
+    /// meaning that the API is not finalized yet and may be changed or replaced in future Ignite releases.
+    ///
+    /// Such APIs are exposed so that users can make use of a feature before the API has been stabilized.
+    /// The expectation is that an API element should be "eventually" stabilized. Incompatible changes are
+    /// allowed for such APIs: API may be removed, changed or stabilized in future Ignite releases
+    /// (both minor and maintenance).
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
+    public sealed class IgniteExperimentalAttribute : Attribute
+    {
+        // No-op.
+    }
+}