diff --git a/src/libstrongswan/pen/pen.h b/src/libstrongswan/pen/pen.h
index e6eb7fc53..396cc7199 100644
--- a/src/libstrongswan/pen/pen.h
+++ b/src/libstrongswan/pen/pen.h
@@ -15,7 +15,7 @@
 
 /**
  * @defgroup pen pen
- * @ingroup tnc
+ * @ingroup libstrongswan
  *
  * @defgroup pent pen
  * @{ @ingroup pen