diff --git a/README.md b/README.md
index 40d2f781cb54dd1d4b3a6ae136a98034e71bdd8f..080343ae022b68e9ef251dd14bc08baa7d5bcbe0 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,25 @@ cp ./slf4j-1.7.25/slf4j-api-1.7.25.jar ../ARDroneForP5/lib/
 cp ./slf4j-1.7.25/slf4j-jdk14-1.7.25.jar ../ARDroneForP5/lib/
 ```
 
-Build ... Generate ARDroneForP5.jar
+Build ... Generate "ARDroneForP5.jar"
+
+```
+cd ../ARDroneForP5
+cd library
+mv ARDroneForP5.jar ARDroneForP5_old.jar
+cd ..
+```
+
+* Need to replace "build.xml".
+* Need to fix 8 java files due to encoding bugs.
+
+```
+ant
+```
+
+* "ARDroneForP5.jar" is generated in the directory "library".
+* 2 warings are displayed. (Unverified)
+
 
 ### Tmp Reference