diff --git a/sys/doc.txt b/sys/doc.txt
index 9dda1b2c8f..7fa868c9c9 100644
--- a/sys/doc.txt
+++ b/sys/doc.txt
@@ -22,3 +22,9 @@
  * See http://wiki.osdev.org/Stack_Smashing_Protector for a more detailed
  * description.
  */
+
+/**
+ * @defgroup    sys_math Math libraries and utilities
+ * @ingroup     sys
+ * @brief       Provides math libraries and utilities for RIOT
+ */