diff --git a/docs/index.md b/docs/index.md
index a7f811e..288f60b 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -8,7 +8,7 @@ Electrostatic discharge can irreparably damage electronic devices. Use O-ESD wit
 ## Features
 * Contact discharge mode and air discharge mode. 
 * Both positive and negative polarity of the output voltages for all levels. 
-* Open-circuit output voltage at terminals from 1 kV to 12 kV for the contact discharge.
+* Open-circuit output voltage at terminals from 1 kV to 8 kV for the contact discharge.
 * Open-circuit output voltage at terminals from 1 kV to 15 kV for the air discharge.
 * Single-discharge mode and user-defined pulse repetition.
 * User-defined hold time for output voltage for air discharge.