diff --git a/credits.txt b/credits.txt
index 7bcd828..fc1f334 100644
--- a/credits.txt
+++ b/credits.txt
@@ -4,7 +4,7 @@ Sangunino model http://www.thingiverse.com/thing:18606 by ax_the_b, CC license.
 
 Spring taken from openscad example 20
 
-x-end.scad and wade.scad uses some elements of the Prusa ones by Josef Prusa, GPL license.
+x-end.scad and wade.scad use some elements of the Prusa ones by Josef Prusa, GPL license.
 
 z_couplings orginally based on http://www.thingiverse.com/thing:7153 by Griffin_Nicoll, GPL license.