diff --git a/sys/include/ps.h b/sys/include/ps.h
index 8a339ae7cb..74713f1150 100644
--- a/sys/include/ps.h
+++ b/sys/include/ps.h
@@ -26,6 +26,9 @@
 extern "C" {
 #endif
 
+/**
+ * @brief Print information to all active threads to stdout.
+ */
 void ps(void);
 int _ps_handler(int argc, char **argv);