diff --git a/README.md b/README.md
index a2bf000..22e6f76 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,17 @@ CMake v3.10+
 * TIM3
 * TIM7
 
+# USART0
+* PA9/PA10
+* 921600/8N1
+
+# TIM2/3
+* PWM output on CH3/CH4
+* 1kHz base frequency
+
+# TIM7
+* Tick source
+
 ## FMC
 FMC clock: 133MHz(Maximum frequency under VOS 3 settings)