diff --git a/cpu/native/include/nativenet.h b/cpu/native/include/nativenet.h
index d7909fc074..057baaf689 100644
--- a/cpu/native/include/nativenet.h
+++ b/cpu/native/include/nativenet.h
@@ -1,4 +1,4 @@
-/**
+/*
  * nativenet transceiver interface
  *
  * A configurable transceiver for the native port.
@@ -16,7 +16,7 @@
  */
 
 /**
- * @defgroup    native_net
+ * @defgroup    native_net Native network interface
  * @ingroup     native_cpu
  * @{
  * @author  Ludwig Ortmann <ludwig.ortmann@fu-berlin.de>
diff --git a/sys/oneway-malloc/include/malloc.h b/sys/oneway-malloc/include/malloc.h
index bd8c4e3d30..e74d1b7b0f 100644
--- a/sys/oneway-malloc/include/malloc.h
+++ b/sys/oneway-malloc/include/malloc.h
@@ -7,7 +7,7 @@
  */
 
 /**
- * @defgroup    oneway_malloc
+ * @defgroup    oneway_malloc Oneway malloc implementation
  * @ingroup     sys
  * @{
  * @file        malloc.h