diff --git a/docs/tech-notes.md b/docs/tech-notes.md
index a7fceef..fb48ec5 100644
--- a/docs/tech-notes.md
+++ b/docs/tech-notes.md
@@ -16,7 +16,7 @@ If you `#define DEBUG`,
 you can use the 
 [included gamepad tester](gamepad.html),
 to see the approximate number of samples as an integer,
-for Y axis 2.
+on the first X axis.
 
 This is approximate,
 because the browser encodes the value as a real number between -1 and 1.