diff --git a/tests/testInteractions.c b/tests/testInteractions.c
index d14c840ec77819bbef5750b897c72139f4d7b2b4..4faebbbdb35c4bc36cca16cb207517f05629f8c1 100644
--- a/tests/testInteractions.c
+++ b/tests/testInteractions.c
@@ -150,6 +150,9 @@ void write_header(char *fileName) {
  *
  * @param parts Particle array to be interacted
  * @param count No. of particles to be interacted
+ * @param serial_inter_func Function pointer to serial interaction function
+ * @param vec_inter_func Function pointer to vectorised interaction function
+ * @param filePrefix Prefix of output files
  *
  */
 void test_interactions(struct part *parts, int count,