diff --git a/Securing-a-MicroPython-System.md b/Securing-a-MicroPython-System.md
index 9add759..5165099 100644
--- a/Securing-a-MicroPython-System.md
+++ b/Securing-a-MicroPython-System.md
@@ -1,6 +1,7 @@
 # Topics
 * Frozen code
 * Disabling the WebREPL
+  * `#define MICROPY_PY_WEBREPL 0`
 * Disabling the Python compiler
   * `#define MICROPY_ENABLE_COMPILER 0`
 * Disable serial REPL access