diff --git a/Promethe_scripts/navigation/drone/readme.md b/Promethe_scripts/navigation/drone/readme.md
index bc872d399c3080273fc413f374170165a0e8dd79..c07ae3dccb5297e2b2d7549498bb1d83ab6b64a1 100644
--- a/Promethe_scripts/navigation/drone/readme.md
+++ b/Promethe_scripts/navigation/drone/readme.md
@@ -8,7 +8,7 @@ altitude_2 is a more robust altitude measure but has high variance and drifts ov
 
 ## Mask
 
-### mask_3rd_axs.txt
+### mask_3rd_axe.txt
 
 Mask to isolate the third axis (normally, the rotation of the joystick).