diff --git a/include/libopencm3/cm3/mpu.h b/include/libopencm3/cm3/mpu.h
index 3d6960af..3ac73907 100644
--- a/include/libopencm3/cm3/mpu.h
+++ b/include/libopencm3/cm3/mpu.h
@@ -17,7 +17,7 @@
  * along with this library.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-/** @defgroup CM3_mpu_defines MPU Defines
+/** @defgroup CM3_mpu_defines Cortex-M MPU Defines
  *
  * @brief <b>libopencm3 Cortex Memory Protection Unit</b>
  *
diff --git a/include/libopencm3/cm3/nvic.h b/include/libopencm3/cm3/nvic.h
index 216833e3..f698854d 100644
--- a/include/libopencm3/cm3/nvic.h
+++ b/include/libopencm3/cm3/nvic.h
@@ -18,7 +18,7 @@
  * You should have received a copy of the GNU Lesser General Public License
  * along with this library.  If not, see <http://www.gnu.org/licenses/>.
  */
-/** @defgroup CM3_nvic_defines NVIC Defines
+/** @defgroup CM3_nvic_defines Cortex-M NVIC Defines
  *
  * @brief <b>libopencm3 Cortex Nested Vectored Interrupt Controller</b>
  *
diff --git a/include/libopencm3/cm3/systick.h b/include/libopencm3/cm3/systick.h
index a355b0f8..0f620bf0 100644
--- a/include/libopencm3/cm3/systick.h
+++ b/include/libopencm3/cm3/systick.h
@@ -17,7 +17,7 @@
  * You should have received a copy of the GNU Lesser General Public License
  * along with this library.  If not, see <http://www.gnu.org/licenses/>.
  */
-/** @defgroup CM3_systick_defines SysTick Defines
+/** @defgroup CM3_systick_defines Cortex-M SysTick Defines
  *
  * @brief <b>libopencm3 Defined Constants and Types for the Cortex SysTick </b>
  *