diff --git a/README.md b/README.md
index e0435da..3434456 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 ## Features
 
-1. Support of 50 Hz, 60 Hz and 400 Hz power frequency.
+1. Support of 50, 60 and 400 Hz power frequency.
 
 ## Dependencies
 
@@ -38,10 +38,19 @@ int main(void)
     ac_dimmer_init_config.triac_port = AVR_PORTD;
     ac_dimmer_init_config.triac_gpio = PORTD3;
     zh_avr_ac_dimmer_init(&ac_dimmer_init_config);
-    zh_avr_ac_dimmer_set(50);
     zh_avr_ac_dimmer_start();
     for (;;)
     {
+        for (uint8_t i = 0; i <= 100; ++i)
+        {
+            zh_avr_ac_dimmer_set(i);
+            _delay_ms(100);
+        }
+        for (uint8_t i = 100; i >= 0; --i)
+        {
+            zh_avr_ac_dimmer_set(i);
+            _delay_ms(100);
+        }
     }
     return 0;
 }