diff --git a/os/various/chprintf.c b/os/various/chprintf.c
index 3cb66bf91..7b02ab3ba 100644
--- a/os/various/chprintf.c
+++ b/os/various/chprintf.c
@@ -21,6 +21,14 @@
    Concepts and parts of this file have been contributed by Fabio Utzig.
  */
 
+/**
+ * @file    chprintf.c
+ * @brief   Mini printf-like functionality.
+ *
+ * @addtogroup chprintf
+ * @{
+ */
+
 #include <stdarg.h>
 
 #include "ch.h"
diff --git a/os/various/chprintf.h b/os/various/chprintf.h
index 039b23a6b..7115b036a 100644
--- a/os/various/chprintf.h
+++ b/os/various/chprintf.h
@@ -22,7 +22,7 @@
  * @file    chprintf.h
  * @brief   Mini printf-like functionality.
  *
- * @addtogroup event_timer
+ * @addtogroup chprintf
  * @{
  */