diff --git a/bbn_m5atomS3_lite_alternator_freq_to_RPM/README.md b/bbn_m5atomS3_lite_alternator_freq_to_RPM/README.md
index 87073cc..765c409 100644
--- a/bbn_m5atomS3_lite_alternator_freq_to_RPM/README.md
+++ b/bbn_m5atomS3_lite_alternator_freq_to_RPM/README.md
@@ -1,6 +1,6 @@
 # Alternator Wave Form (from 'W' terminal) to Frequency and to RPM via PC817 optocoupler
 
-There are small ready-to-use PCBs which include PC817 optocoupler and a circuit with one light emiting diod, two resistors and
+There are small ready-to-use PCBs which include PC817 optocoupler and a circuit with one light emiting diode, two resistors and
 two screw-in terminals (2-pole for input and 3-pole for output GND/OUT/VCC)
 
 You can find them searching Internet for: