diff --git a/apps/shell/shell-download.c b/apps/shell/shell-download.c
index 1da5ad51a..7c2d419e8 100644
--- a/apps/shell/shell-download.c
+++ b/apps/shell/shell-download.c
@@ -31,7 +31,9 @@
  */
 
 /**
- * \file Shell command for downloading files from a remote node.
+ * \file
+ *
+ * Shell command for downloading files from a remote node.
  * Example usage:
  * 'download \<node addr\> \<filename\> | write \<local_filename\>'.
  *
diff --git a/core/net/llsec/llsec802154.h b/core/net/llsec/llsec802154.h
index 5d81d9cb4..6ab6a9793 100644
--- a/core/net/llsec/llsec802154.h
+++ b/core/net/llsec/llsec802154.h
@@ -43,7 +43,7 @@
  */
 
 /**
- * \defgroup llsec802154
+ * \defgroup llsec802154 Link Layer Security Common Functionality
  * 
  * Common functionality of 802.15.4-compliant llsec_drivers.
  * 
diff --git a/core/net/llsec/noncoresec/noncoresec.h b/core/net/llsec/noncoresec/noncoresec.h
index 493ff5ce5..1e2172590 100644
--- a/core/net/llsec/noncoresec/noncoresec.h
+++ b/core/net/llsec/noncoresec/noncoresec.h
@@ -43,7 +43,7 @@
  */
 
 /**
- * \defgroup noncoresec
+ * \defgroup noncoresec LLSEC driver using a network-wide key (NONCORESEC)
  * 
  * Noncompromise-resilient 802.15.4 security
  * 
diff --git a/core/net/llsec/nullsec.h b/core/net/llsec/nullsec.h
index 2682bd343..30488e5d4 100644
--- a/core/net/llsec/nullsec.h
+++ b/core/net/llsec/nullsec.h
@@ -43,7 +43,7 @@
  */
 
 /**
- * \defgroup nullsec
+ * \defgroup nullsec LLSEC driver with zero security (NULLSEC)
  * 
  * Insecure link layer security driver.
  * 
diff --git a/core/net/mac/frame802154.h b/core/net/mac/frame802154.h
index 4b3a81049..64a367120 100644
--- a/core/net/mac/frame802154.h
+++ b/core/net/mac/frame802154.h
@@ -44,7 +44,7 @@
 */
 
 /**
- *    \addtogroup net 802.15.4 frame creation and parsing
+ *    \addtogroup net
  *    @{
  */