diff --git a/include/libopencm3/cm3/doc-cm3.h b/include/libopencm3/cm3/doc-cm3.h
index 0f76370f..6f9392f6 100644
--- a/include/libopencm3/cm3/doc-cm3.h
+++ b/include/libopencm3/cm3/doc-cm3.h
@@ -20,3 +20,7 @@ LGPL License Terms @ref lgpl_license
 LGPL License Terms @ref lgpl_license
 */
 
+/** @defgroup CM3_files Cortex Core Peripheral APIs
+ * APIs for Coretex Core peripherals
+ */
+