diff --git a/README-configuration.md b/README-configuration.md
index b0c6821..611e1b2 100644
--- a/README-configuration.md
+++ b/README-configuration.md
@@ -9,6 +9,7 @@ Alfa SPID RAS.
 * Reset factory settings:
 Press and hold `CANCEL`, `CCW`, and `CW` simultaneously until
 the display says `RESET EE`.
+Press `CANCEL` first.
 
 * Go to `SETUP`:
 Press and hold `SETUP/ITEM` until the display says `SETUP`.