diff --git a/arch/arm/src/stm32/stm32_sdio.h b/arch/arm/src/stm32/stm32_sdio.h
index 2ea7221e96c..bd79405afc3 100644
--- a/arch/arm/src/stm32/stm32_sdio.h
+++ b/arch/arm/src/stm32/stm32_sdio.h
@@ -1,4 +1,4 @@
-/************************************************************************************
+/****************************************************************************
  * arch/arm/src/stm32/stm32_sdio.h
  *
  *   Copyright (C) 2009, 2011, 2015 Gregory Nutt. All rights reserved.
@@ -31,14 +31,14 @@
  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  *
- ************************************************************************************/
+ ****************************************************************************/
 
 #ifndef __ARCH_ARM_SRC_STM32_STM32_SDIO_H
 #define __ARCH_ARM_SRC_STM32_STM32_SDIO_H
 
-/************************************************************************************
+/****************************************************************************
  * Included Files
- ************************************************************************************/
+ ****************************************************************************/
 
 #include <nuttx/config.h>
 #include <sys/types.h>
@@ -47,9 +47,9 @@
 #include "chip.h"
 #include "hardware/stm32_sdio.h"
 
-/************************************************************************************
- * Public Functions
- ************************************************************************************/
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
 
 #ifndef __ASSEMBLY__
 
@@ -72,7 +72,8 @@ extern "C"
  *   slotno - Not used.
  *
  * Returned Value:
- *   A reference to an SDIO interface structure.  NULL is returned on failures.
+ *   A reference to an SDIO interface structure.  NULL is returned on
+ *   failures.
  *
  ****************************************************************************/