diff --git a/README.md b/README.md
index 80ffd0c..b8ff0ba 100644
--- a/README.md
+++ b/README.md
@@ -85,7 +85,7 @@ See doc/note/firmware-update.
 
 How to debug
 ============
-Ensure that you have arm-none-eabi-gdb installed and then you must compile the Gnuk firmware with --enable-debug option. After flashing Gnuk debug firmware one will see two interfaces, one is CCID/ICCD device and the another is a virtual COM port.
+Ensure that you have arm-none-eabi-gdb installed and then you must configure and compile the Gnuk firmware with --enable-debug option. After flashing Gnuk debug firmware one will see two interfaces, one is CCID/ICCD device and the another is a virtual COM port.
 
 Open the virtual COM with the following command:
 ```