diff --git a/src/ODE/ODESolvers/SIBS/SIBS.H b/src/ODE/ODESolvers/SIBS/SIBS.H
index d77e3e128d..ced087ca92 100644
--- a/src/ODE/ODESolvers/SIBS/SIBS.H
+++ b/src/ODE/ODESolvers/SIBS/SIBS.H
@@ -27,6 +27,11 @@ Class
 Description
     Foam::SIBS
 
+    Bader, G. and Deuflhard, P.
+    "A Semi-Implicit Mid-Point Rule for
+     Stiff Systems of Ordinary Differential Equations."
+     Numer. Math. 41, 373-398, 1983.
+
 SourceFiles
     SIMPR.C
     polyExtrapolate.C