diff --git a/src/build_test_firmware.md b/src/build_test_firmware.md
index e321bc5..f2bf63c 100644
--- a/src/build_test_firmware.md
+++ b/src/build_test_firmware.md
@@ -17,7 +17,7 @@
 
 1. Build firmware (see commands below)
 2. Flash firmware and settings
-3. Test hardware
+3. Test hardware with the PSU, which is going to be shipped
 4. Create a flash-drive with `device_db.py` file for customers (FAT32)
 
 ### CLI commands - build and flash
@@ -43,7 +43,7 @@ artiq_flash --srcbuild -d artiq_kasli/<variant>/
 3. Insert SD card to the Kasli-SoC and boot
 4. Change IP from the default one: `artiq_coremgmt -D 192.168.1.56 config write -s ip 192.168.1.75`
 5. Reboot and check it works on new IP address
-6. Test hardware
+6. Test hardware with the PSU, which is going to be shipped
 7. Create a flash-drive with `device_db.py` file for customers (FAT32)
 
 ### CLI commands - build and flash