diff --git a/003-Decompile-APK/README.md b/003-Decompile-APK/README.md
index 55c29a6..79b479a 100644
--- a/003-Decompile-APK/README.md
+++ b/003-Decompile-APK/README.md
@@ -8,10 +8,10 @@ In the directory you unzipped in the previous lab, run the following command:
 d2j-dex2jar classes.dex
 ```
 
-This creates a files named `classes_dex2jar.jar` which we can then open using the GUI tool for exploring .jar files called `jd-gui`:
+This creates a files named `classes-dex2jar.jar` which we can then open using the GUI tool for exploring .jar files called `jd-gui`:
 
 ```
-jd-gui classes_dex2jar.jar
+jd-gui classes-dex2jar.jar
 ```
 
 Take some time to browse the classes in the applications in jd-gui. Did you find anything interesting or revealing about the application?