diff --git a/.idea/misc.xml b/.idea/misc.xml
index 703e5d4b89..cd2f3a654d 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -5,6 +5,41 @@
       <configuration PROFILE_NAME="Debug" CONFIG_NAME="Debug" />
     </configurations>
   </component>
+  <component name="NullableNotNullManager">
+    <option name="myDefaultNullable" value="android.support.annotation.Nullable" />
+    <option name="myDefaultNotNull" value="androidx.annotation.NonNull" />
+    <option name="myNullables">
+      <value>
+        <list size="10">
+          <item index="0" class="java.lang.String" itemvalue="org.jetbrains.annotations.Nullable" />
+          <item index="1" class="java.lang.String" itemvalue="javax.annotation.Nullable" />
+          <item index="2" class="java.lang.String" itemvalue="javax.annotation.CheckForNull" />
+          <item index="3" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.Nullable" />
+          <item index="4" class="java.lang.String" itemvalue="android.support.annotation.Nullable" />
+          <item index="5" class="java.lang.String" itemvalue="androidx.annotation.Nullable" />
+          <item index="6" class="java.lang.String" itemvalue="androidx.annotation.RecentlyNullable" />
+          <item index="7" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.qual.Nullable" />
+          <item index="8" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.compatqual.NullableDecl" />
+          <item index="9" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.compatqual.NullableType" />
+        </list>
+      </value>
+    </option>
+    <option name="myNotNulls">
+      <value>
+        <list size="9">
+          <item index="0" class="java.lang.String" itemvalue="org.jetbrains.annotations.NotNull" />
+          <item index="1" class="java.lang.String" itemvalue="javax.annotation.Nonnull" />
+          <item index="2" class="java.lang.String" itemvalue="edu.umd.cs.findbugs.annotations.NonNull" />
+          <item index="3" class="java.lang.String" itemvalue="android.support.annotation.NonNull" />
+          <item index="4" class="java.lang.String" itemvalue="androidx.annotation.NonNull" />
+          <item index="5" class="java.lang.String" itemvalue="androidx.annotation.RecentlyNonNull" />
+          <item index="6" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.qual.NonNull" />
+          <item index="7" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.compatqual.NonNullDecl" />
+          <item index="8" class="java.lang.String" itemvalue="org.checkerframework.checker.nullness.compatqual.NonNullType" />
+        </list>
+      </value>
+    </option>
+  </component>
   <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
diff --git a/app/src/main/java/com/tangem/data/network/Server.java b/app/src/main/java/com/tangem/data/network/Server.java
index 9be4f58449..832e0495c2 100644
--- a/app/src/main/java/com/tangem/data/network/Server.java
+++ b/app/src/main/java/com/tangem/data/network/Server.java
@@ -32,6 +32,9 @@ public class Server {
         }
     }
 
+    /**
+     * https://public-node.rsk.co/
+     */
     public static class ApiRootstock {
         public static final String URL_ROOTSTOCK = ServerURL.API_ROOTSTOCK;
 
diff --git a/app/src/main/java/com/tangem/data/network/ServerApiRootstock.java b/app/src/main/java/com/tangem/data/network/ServerApiRootstock.java
index 0bcf5b7b4f..198f5cc6b0 100644
--- a/app/src/main/java/com/tangem/data/network/ServerApiRootstock.java
+++ b/app/src/main/java/com/tangem/data/network/ServerApiRootstock.java
@@ -16,7 +16,7 @@ public class ServerApiRootstock {
 
     /**
      * HTTP
-     * Infura
+     * Rootstock
      * <p>
      * eth_getBalance
      * eth_getTransactionCount