diff --git a/doxygen/trigonometric.dox b/doxygen/trigonometric.dox
new file mode 100644
index 0000000..52819eb
--- /dev/null
+++ b/doxygen/trigonometric.dox
@@ -0,0 +1,8 @@
+/* This file only contains help information for doxygen */
+
+/**
+ * @defgroup trigonometric Trigonometric Helper Functions
+ * @description The trigonometric helper function will be used in future releases to pcalculate bounding boxes
+ * @note Currently not in use!
+ * @warning Code is incomplete. DO NOT USE!
+ */
diff --git a/trigonometric/bounding-box.c b/trigonometric/bounding-box.c
index df8b873..3499ce4 100644
--- a/trigonometric/bounding-box.c
+++ b/trigonometric/bounding-box.c
@@ -23,6 +23,11 @@
  * @author Mario Hüttel <mario.huettel@gmx.net>
  */
 
+/**
+ * @addtogroup trigonometric
+ * @{
+ */
+
 #include <stdio.h>
 #include "bounding-box.h"
 #include <math.h>
@@ -137,3 +142,5 @@ void bounding_box_update_point(union bounding_box *destination, conv_generic_to_
 {
 
 }
+
+/** @} */
diff --git a/trigonometric/bounding-box.h b/trigonometric/bounding-box.h
index d524c47..e3915e1 100644
--- a/trigonometric/bounding-box.h
+++ b/trigonometric/bounding-box.h
@@ -23,6 +23,11 @@
  * @author Mario Hüttel <mario.huettel@gmx.net>
  */
 
+/**
+ * @addtogroup trigonometric
+ * @{
+ */
+
 #ifndef _BOUNDING_BOX_H_
 #define _BOUNDING_BOX_H_
 #include <glib.h>
@@ -42,4 +47,7 @@ void bounding_box_calculate_polygon(GList *vertices, conv_generic_to_vector_2d_t
 void bounding_box_update_box(union bounding_box *destination, union bounding_box *update);
 void bounding_box_prepare_empty(union bounding_box *box);
 void bounding_box_update_point(union bounding_box *destination, conv_generic_to_vector_2d_t conv_func, void *pt);
+
 #endif /* _BOUNDING_BOX_H_ */
+
+/** @} */
diff --git a/trigonometric/vector-operations.c b/trigonometric/vector-operations.c
index bb741e5..4cdbca4 100644
--- a/trigonometric/vector-operations.c
+++ b/trigonometric/vector-operations.c
@@ -23,6 +23,11 @@
  * @author Mario Hüttel <mario.huettel@gmx.net>
  */
 
+/**
+ * @addtogroup trigonometric
+ * @{
+ */
+
 #include "vector-operations.h"
 #include <math.h>
 #include <stdlib.h>
@@ -141,3 +146,5 @@ void vector_2d_add(struct vector_2d *res, struct vector_2d *a, struct vector_2d
 		res->y = a->y + b->y;
 	}
 }
+
+/** @} */
diff --git a/trigonometric/vector-operations.h b/trigonometric/vector-operations.h
index 3b98573..e4b04b7 100644
--- a/trigonometric/vector-operations.h
+++ b/trigonometric/vector-operations.h
@@ -23,6 +23,12 @@
  * @author Mario Hüttel <mario.huettel@gmx.net>
  */
 
+/**
+ * @addtogroup trigonometric
+ * @{
+ */
+
+
 #ifndef _VECTOR_OPERATIONS_H_
 #define _VECTOR_OPERATIONS_H_
 
@@ -48,3 +54,5 @@ void vector_2d_subtract(struct vector_2d *res, struct vector_2d *a, struct vecto
 void vector_2d_add(struct vector_2d *res, struct vector_2d *a, struct vector_2d *b);
 
 #endif /* _VECTOR_OPERATIONS_H_ */
+
+/** @} */