diff --git a/lib/stm32/common/i2c_common_v1.c b/lib/stm32/common/i2c_common_v1.c
index 2cd5785a..85c2f893 100644
--- a/lib/stm32/common/i2c_common_v1.c
+++ b/lib/stm32/common/i2c_common_v1.c
@@ -1,4 +1,5 @@
-/** @addtogroup i2c_file
+/** @addtogroup i2c_file I2C peripheral API
+ * @ingroup peripheral_apis
 
 @author @htmlonly © @endhtmlonly 2010
 Thomas Otto <tommi@viadmin.org>
diff --git a/lib/stm32/common/i2c_common_v2.c b/lib/stm32/common/i2c_common_v2.c
index 04ae7623..fbb339bc 100644
--- a/lib/stm32/common/i2c_common_v2.c
+++ b/lib/stm32/common/i2c_common_v2.c
@@ -1,5 +1,5 @@
-/** @addtogroup i2c_file
- *
+/** @addtogroup i2c_file I2C peripheral API
+ * @ingroup peripheral_apis
  */
 
 /*