diff --git a/README.md b/README.md
index ae8259c..5bd89ac 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,6 @@ A thermocouple (temperature sensor) is located in the T12 soldering tip. It crea
 # 3. Heater High Side Switch with N-Channel MOSFET and Charge Pump #
 
 The microcontroller switches the heater on and off via the MOSFET. Since the temperature measurement must be done over the same line and against
-ground, the MOSFET has to be placed between the supply voltage and the heater (high-side switch). A P-Channel MOSFET is normally used for this configuration. However, N-Channel MOSFETs usually have a lower resistance (RDS (on)), in the case of the IRLR7843 only 3 milliohms. A low resistance means a higher efficiency and a lower heat development of the MOSFET. For an N-channel MOSFET to function as a high-side switch, an additional circuit is required to maintain a positive GATE-TO-SOURCE voltage even when the MOSFET is switched on. This is done using a so-called charge pump consisting of a capacitor and a diode.
+ground, the MOSFET has to be placed between the supply voltage and the heater (high-side switch). A P-Channel MOSFET is normally used for this configuration. However, N-Channel MOSFETs usually have a lower resistance (RDS (on)), in the case of the IRLR7843 only 3 milliohms. A low resistance means a higher efficiency and a lower heat development of the MOSFET. For an N-channel MOSFET to function as a high-side switch, an additional circuit is required to maintain a positive GATE-TO-SOURCE voltage after the MOSFET is switched on. This is done using a so-called charge pump consisting of a capacitor and a diode.
 
 ![SolderingStationV2_ChargePump.png](https://image.easyeda.com/pullimage/UwAxl6ON0Pn9orkxrE9tfgfZAGFxWH5Xc9pkDvmm.png)