diff --git a/src/main/java/com/r35157/libs/random/impl/ref/RandomValueGeneratorStringImpl.java b/src/main/java/com/r35157/libs/random/impl/ref/RandomValueGeneratorStringImpl.java
index f927f26..519a7a3 100644
--- a/src/main/java/com/r35157/libs/random/impl/ref/RandomValueGeneratorStringImpl.java
+++ b/src/main/java/com/r35157/libs/random/impl/ref/RandomValueGeneratorStringImpl.java
@@ -5,7 +5,7 @@ import com.r35157.libs.random.RandomValueGeneratorString;
 import org.jetbrains.annotations.NotNull;
 
 public class RandomValueGeneratorStringImpl implements RandomValueGeneratorString {
-    public RandomValueGeneratorStringImpl(RandomValueGeneratorInt rvgi) {
+    public RandomValueGeneratorStringImpl(@NotNull RandomValueGeneratorInt rvgi) {
         this.rvgi = rvgi;
     }