diff --git a/include/libopencm3/efm32/common/prs_common.h b/include/libopencm3/efm32/common/prs_common.h
index 82fde156..fa8bad1b 100644
--- a/include/libopencm3/efm32/common/prs_common.h
+++ b/include/libopencm3/efm32/common/prs_common.h
@@ -1,3 +1,5 @@
+/** @addtogroup prs_defines
+ */
 /*
  * This file is part of the libopencm3 project.
  *
@@ -17,12 +19,13 @@
  * along with this library.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LIBOPENCM3_EFM32_PRS_H
-#define LIBOPENCM3_EFM32_PRS_H
+#pragma once
 
 #include <libopencm3/cm3/common.h>
 #include <libopencm3/efm32/memorymap.h>
 
+/**@{*/
+
 #define PRS_SWPULSE		MMIO32(PRS_BASE + 0x000)
 #define PRS_SWLEVEL		MMIO32(PRS_BASE + 0x004)
 #define PRS_ROUTE		MMIO32(PRS_BASE + 0x008)
@@ -359,5 +362,4 @@ void prs_set_signal(enum prs_ch ch, uint32_t sig);
 
 END_DECLS
 
-#endif
-
+/**@}*/
\ No newline at end of file
diff --git a/include/libopencm3/efm32/ezr32wg/prs.h b/include/libopencm3/efm32/ezr32wg/prs.h
index 6b58af82..6ce36335 100644
--- a/include/libopencm3/efm32/ezr32wg/prs.h
+++ b/include/libopencm3/efm32/ezr32wg/prs.h
@@ -1,3 +1,11 @@
+/** @defgroup prs_defines PRS Defines
+ *
+ * @brief <b>Defined Constants and Types for the Peripheral Reflex System</b>
+ *
+ * @ingroup EZR32WG_defines
+ *
+ * LGPL License Terms @ref lgpl_license
+ */
 /*
  * This file is part of the libopencm3 project.
  *
@@ -17,9 +25,6 @@
  * along with this library.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LIBOPENCM3_EFM32_EZR32WG_PRS_H
-#define LIBOPENCM3_EFM32_EZR32WG_PRS_H
+#pragma once
 
 #include <libopencm3/efm32/common/prs_common.h>
-
-#endif
diff --git a/include/libopencm3/efm32/lg/prs.h b/include/libopencm3/efm32/lg/prs.h
index a2469457..e059892e 100644
--- a/include/libopencm3/efm32/lg/prs.h
+++ b/include/libopencm3/efm32/lg/prs.h
@@ -1,3 +1,11 @@
+/** @defgroup prs_defines PRS Defines
+ *
+ * @brief <b>Defined Constants and Types for the Peripheral Reflex System</b>
+ *
+ * @ingroup EFM32LG_defines
+ *
+ * LGPL License Terms @ref lgpl_license
+ */
 /*
  * This file is part of the libopencm3 project.
  *
@@ -17,9 +25,6 @@
  * along with this library.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LIBOPENCM3_EFM32_LG_PRS_H
-#define LIBOPENCM3_EFM32_LG_PRS_H
+#pragma once
 
 #include <libopencm3/efm32/common/prs_common.h>
-
-#endif
diff --git a/include/libopencm3/efm32/wg/prs.h b/include/libopencm3/efm32/wg/prs.h
index 2df0410d..42afc138 100644
--- a/include/libopencm3/efm32/wg/prs.h
+++ b/include/libopencm3/efm32/wg/prs.h
@@ -1,3 +1,11 @@
+/** @defgroup prs_defines PRS Defines
+ *
+ * @brief <b>Defined Constants and Types for the Peripheral Reflex System</b>
+ *
+ * @ingroup EFM32WG_defines
+ *
+ * LGPL License Terms @ref lgpl_license
+ */
 /*
  * This file is part of the libopencm3 project.
  *
@@ -17,9 +25,6 @@
  * along with this library.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef LIBOPENCM3_EFM32_WG_PRS_H
-#define LIBOPENCM3_EFM32_WG_PRS_H
+#pragma once
 
 #include <libopencm3/efm32/common/prs_common.h>
-
-#endif