diff --git a/Appendix-A:-Printed-circuit-boards.md b/Appendix-A:-Printed-circuit-boards.md
index 93cba30..a5dc306 100644
--- a/Appendix-A:-Printed-circuit-boards.md
+++ b/Appendix-A:-Printed-circuit-boards.md
@@ -90,7 +90,7 @@ If you've never soldered surface mount components before, or want a refresher on
 
 Lastly, you'll need to follow a set of special instructions to assemble the PMW3360 sensor and the optic. [Take a look at page 11 of the official PMW3360 datasheet to find out how to do this](https://d3s5r33r268y59.cloudfront.net/datasheets/9604/2017-05-07-18-19-11/PMS0058-PMW3360DM-T2QU-DS-R1.50-26092016._20161202173741.pdf) (page 8 has visuals, for those of you who like purdy pictures).
 
-**MAKE SURE THAT THE PMW3360 IS ORIENTED CORRECTLY WHEN YOU SOLDER IT!** This is a really easy step to mess up, so *DOUBLE-CHECK IT!*
+**MAKE SURE THAT THE PMW3360 IS ORIENTED CORRECTLY BEFORE YOU SOLDER IT!** This is a really easy step to mess up, so *DOUBLE-CHECK IT!*
 
 ## Step 5: All done!
 **TODO PIX a base PCB and a vertical PCB laid out side by side, fully soldered but not yet assembled**