diff --git a/include/libopencm3/stm32/f0/rcc.h b/include/libopencm3/stm32/f0/rcc.h
index 9b7ef68b..82e03eb1 100644
--- a/include/libopencm3/stm32/f0/rcc.h
+++ b/include/libopencm3/stm32/f0/rcc.h
@@ -137,14 +137,19 @@ Control</b>
 
 #define RCC_CFGR_PPRE_SHIFT			8
 #define RCC_CFGR_PPRE				(7 << RCC_CFGR_PPRE_SHIFT)
+/** @defgroup rcc_cfgr_apb1pre RCC_CFGR APB prescale Factors
+@{*/
 #define RCC_CFGR_PPRE_NODIV			(0 << RCC_CFGR_PPRE_SHIFT)
 #define RCC_CFGR_PPRE_DIV2			(4 << RCC_CFGR_PPRE_SHIFT)
 #define RCC_CFGR_PPRE_DIV4			(5 << RCC_CFGR_PPRE_SHIFT)
 #define RCC_CFGR_PPRE_DIV8			(6 << RCC_CFGR_PPRE_SHIFT)
 #define RCC_CFGR_PPRE_DIV16			(7 << RCC_CFGR_PPRE_SHIFT)
+/**@}*/
 
 #define RCC_CFGR_HPRE_SHIFT			4
 #define RCC_CFGR_HPRE				(0xf << RCC_CFGR_HPRE_SHIFT)
+/** @defgroup rcc_cfgr_ahbpre RCC_CFGR AHB prescale Factors
+@{*/
 #define RCC_CFGR_HPRE_NODIV			(0x0 << RCC_CFGR_HPRE_SHIFT)
 #define RCC_CFGR_HPRE_DIV2			(0x8 << RCC_CFGR_HPRE_SHIFT)
 #define RCC_CFGR_HPRE_DIV4			(0x9 << RCC_CFGR_HPRE_SHIFT)
@@ -154,6 +159,7 @@ Control</b>
 #define RCC_CFGR_HPRE_DIV128			(0xd << RCC_CFGR_HPRE_SHIFT)
 #define RCC_CFGR_HPRE_DIV256			(0xe << RCC_CFGR_HPRE_SHIFT)
 #define RCC_CFGR_HPRE_DIV512			(0xf << RCC_CFGR_HPRE_SHIFT)
+/**@}*/
 
 #define RCC_CFGR_SWS_SHIFT			2
 #define RCC_CFGR_SWS				(3 << RCC_CFGR_SWS_SHIFT)
diff --git a/lib/stm32/f0/rcc.c b/lib/stm32/f0/rcc.c
index e0758c0a..a0e859b5 100644
--- a/lib/stm32/f0/rcc.c
+++ b/lib/stm32/f0/rcc.c
@@ -467,7 +467,7 @@ void rcc_set_pllxtpre(uint32_t pllxtpre)
 /*---------------------------------------------------------------------------*/
 /** @brief RCC Set the APB Prescale Factor.
  *
- * @param[in] ppre1 Unsigned int32. APB prescale factor @ref rcc_cfgr_apb1pre
+ * @param[in] ppre Unsigned int32. APB prescale factor @ref rcc_cfgr_apb1pre
  */
 
 void rcc_set_ppre(uint32_t ppre)