diff --git a/src/main/java/net/runelite/mapping/ObfuscatedSignature.java b/src/main/java/net/runelite/mapping/ObfuscatedSignature.java
new file mode 100644
index 0000000000..4ec722b6b5
--- /dev/null
+++ b/src/main/java/net/runelite/mapping/ObfuscatedSignature.java
@@ -0,0 +1,15 @@
+package net.runelite.mapping;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface ObfuscatedSignature
+{
+	String signature();
+
+	String garbageValue(); // valid garbage value for last parameter. can't be an Object because Java.
+}