diff --git a/README.md b/README.md
index d91c5ce..49bc537 100644
--- a/README.md
+++ b/README.md
@@ -181,7 +181,7 @@ excelToSQLite.importFromFile(directory_path, new ExcelToSQLite.ImportListener()
 ```
 ## Proguard for SQLite2XL
 ```
--dontwarn org.apache.poi.**
+-keep public class org.apache.poi.** {*;}
 ```
 
 ## Using SQLite2XL