diff --git a/app/src/main/java/com/vestrel00/daggerbutterknifemvp/ui/common/BaseActivity.java b/app/src/main/java/com/vestrel00/daggerbutterknifemvp/ui/common/BaseActivity.java
index 0395f7a..b00cd82 100644
--- a/app/src/main/java/com/vestrel00/daggerbutterknifemvp/ui/common/BaseActivity.java
+++ b/app/src/main/java/com/vestrel00/daggerbutterknifemvp/ui/common/BaseActivity.java
@@ -20,6 +20,7 @@
 import android.app.Fragment;
 import android.app.FragmentManager;
 import android.os.Bundle;
+import android.support.annotation.IdRes;
 import android.support.annotation.Nullable;
 
 import com.vestrel00.daggerbutterknifemvp.navigation.Navigator;
@@ -63,7 +64,7 @@ public final AndroidInjector<Fragment> fragmentInjector() {
         return fragmentInjector;
     }
 
-    protected final void addFragment(int containerViewId, Fragment fragment) {
+    protected final void addFragment(@IdRes int containerViewId, Fragment fragment) {
         fragmentManager.beginTransaction()
                 .add(containerViewId, fragment)
                 .commit();
diff --git a/app/src/main/java/com/vestrel00/daggerbutterknifemvp/ui/common/view/BaseFragment.java b/app/src/main/java/com/vestrel00/daggerbutterknifemvp/ui/common/view/BaseFragment.java
index 70a9291..516fa99 100644
--- a/app/src/main/java/com/vestrel00/daggerbutterknifemvp/ui/common/view/BaseFragment.java
+++ b/app/src/main/java/com/vestrel00/daggerbutterknifemvp/ui/common/view/BaseFragment.java
@@ -20,6 +20,8 @@
 import android.app.FragmentManager;
 import android.content.Context;
 import android.os.Bundle;
+import android.support.annotation.IdRes;
+import android.support.annotation.Nullable;
 import android.view.View;
 
 import javax.inject.Inject;
@@ -57,6 +59,7 @@ public abstract class BaseFragment extends Fragment implements HasFragmentInject
     @Inject
     DispatchingAndroidInjector<Fragment> childFragmentInjector;
 
+    @Nullable
     private Unbinder viewUnbinder;
 
     @Override
@@ -103,7 +106,7 @@ public final AndroidInjector<Fragment> fragmentInjector() {
         return childFragmentInjector;
     }
 
-    protected final void addChildFragment(int containerViewId, Fragment fragment) {
+    protected final void addChildFragment(@IdRes int containerViewId, Fragment fragment) {
         childFragmentManager.beginTransaction()
                 .add(containerViewId, fragment)
                 .commit();