diff --git a/docs/purchase-connector.md b/docs/purchase-connector.md
index 5b15d72..fa452e2 100644
--- a/docs/purchase-connector.md
+++ b/docs/purchase-connector.md
@@ -43,6 +43,7 @@ _Android Only_ - If you are using ProGuard, add the following keep rules to your
 -keep class com.appsflyer.** { *; }
 -keep class kotlin.jvm.internal.Intrinsics{ *; }
 -keep class kotlin.collections.**{ *; }
+-keep class kotlin.Result$Companion { *; }
 ```
 
 ## Strict Mode