1 files changed, 5 insertions, 0 deletions
diff --git a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/sources/Source.java b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/sources/Source.java
index 14d9ef1cc5..44f4a6c344 100644
--- a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/sources/Source.java
+++ b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/sources/Source.java
@@ -2,6 +2,7 @@ package com.mapbox.mapboxsdk.style.sources;
 
 import android.support.annotation.Keep;
 
+import android.support.annotation.NonNull;
 import com.mapbox.mapboxsdk.utils.ThreadUtils;
 
 /**
@@ -39,6 +40,7 @@ public abstract class Source {
    *
    * @return the source id
    */
+  @NonNull
   public String getId() {
     checkThread();
     return nativeGetId();
@@ -52,6 +54,7 @@ public abstract class Source {
    *
    * @return the string representation of the attribution in html format
    */
+  @NonNull
   public String getAttribution() {
     checkThread();
     return nativeGetAttribution();
@@ -66,9 +69,11 @@ public abstract class Source {
     return nativePtr;
   }
 
+  @NonNull
   @Keep
   protected native String nativeGetId();
 
+  @NonNull
   @Keep
   protected native String nativeGetAttribution();
 }