diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7ebfec5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.zip
+*.hex
diff --git a/docs/tech-notes.md b/docs/tech-notes.md
index 8f8e890..a7fceef 100644
--- a/docs/tech-notes.md
+++ b/docs/tech-notes.md
@@ -12,9 +12,10 @@ Sample Rate
 
 The number of samples taken since the last HID report
 is sent as the second Y axis.
-If you use the 
+If you `#define DEBUG`,
+you can use the 
 [included gamepad tester](gamepad.html),
-it will show the approximate number of samples as an integer,
+to see the approximate number of samples as an integer,
 for Y axis 2.
 
 This is approximate,