diff --git a/sys/include/matstat.h b/sys/include/matstat.h
index 74c99df101..95e322f735 100644
--- a/sys/include/matstat.h
+++ b/sys/include/matstat.h
@@ -7,9 +7,7 @@
  */
 
 /**
- * @defgroup    sys_matstat Matstat - Integer mathematical statistics library
- * @ingroup     sys
- * @brief       Library for computing 1-pass statistics
+ * @ingroup     sys_matstat
  *
  * The Matstat library uses single pass algorithms to compute statistic measures
  * such as mean and variance over many values. The values can be immediately
diff --git a/sys/matstat/doc.txt b/sys/matstat/doc.txt
new file mode 100644
index 0000000000..f51cecd850
--- /dev/null
+++ b/sys/matstat/doc.txt
@@ -0,0 +1,5 @@
+/**
+ * @defgroup    sys_matstat Matstat - Integer mathematical statistics library
+ * @ingroup     sys_math
+ * @brief       Library for computing 1-pass statistics
+ */