diff --git a/tests/periph_timer_cli/README.md b/tests/periph_timer_cli/README.md
index 08d1419c..036f4c40 100644
--- a/tests/periph_timer_cli/README.md
+++ b/tests/periph_timer_cli/README.md
@@ -10,7 +10,7 @@ based HIL setup.
 Consult the 'help' shell command for available actions.
 
 Running this test with robot framework is done with this command:
-`BOARD=whatever PORT=/dev/ttyACM0 PHILIP_PORT=/dev/ttyACM1 DBG0_PORT=1 DEBUG_PIN=3 make robot-test`
+`BOARD=whatever PORT=/dev/ttyACM0 PHILIP_PORT=/dev/ttyACM1 DEBUG0_PORT=1 DEBUG0_PIN=3 make robot-test`
 
-Where DBG0_PORT and DEBUG_PIN are the RIOT specific pin identifiers of the DUT
-pin that is connected to PHiLIPs DEBUG0 pin.
+Where DEBUG0_PORT and DEBUG0_PIN are the RIOT specific pin identifiers of the
+DUT pin that is connected to PHiLIPs DEBUG0 pin.