diff --git a/Source/chem.f90 b/Source/chem.f90
index 7c42c800dd4..419345bd5cd 100644
--- a/Source/chem.f90
+++ b/Source/chem.f90
@@ -1,9 +1,12 @@
+!> \brief CVODE interface for detailed chemistry calculation
 ! CALL CVODE FOR SOLVING CHEMISTRY 
 ! THE DERIVATIVE AND JACOBIAN FUNCTION TRACK N_TRACKED_SPECIES+2
 ! VARIABLES. THE +2 IS TEMPERATURE AND PRESSURE.
 
-
+!> @cond DOXYGEN_IGNORE
 #ifdef WITH_SUNDIALS
+!> @endcond
+
 
 MODULE CVODE_INTERFACE
 
@@ -941,4 +944,7 @@ SUBROUTINE CVODESTATS(CVODE_MEM)
 END SUBROUTINE CVODESTATS
 
 END MODULE CVODE_INTERFACE
+!> @cond DOXYGEN_IGNORE
 #endif
+!> @endcond
+