diff --git a/include/libopencm3/stm32/f4/crypto.h b/include/libopencm3/stm32/f4/crypto.h
index 3dd433f7..5e6d4e46 100644
--- a/include/libopencm3/stm32/f4/crypto.h
+++ b/include/libopencm3/stm32/f4/crypto.h
@@ -1,6 +1,6 @@
 /** @defgroup crypto_defines CRYPTO Defines
  *
- * @brief <b>Defined constants and Types for the STM32F4xx Crypto Coprocessor
+ * @brief <b>Defined constants and Types for the STM32F4xx Crypto Coprocessor</b>
  *
  * @ingroup STM32F4xx_defines
  *