diff --git a/tracy/tracy/src/nsls-ii_lib.cc b/tracy/tracy/src/nsls-ii_lib.cc
index 9a2d52e1df9ec52d50f3dde258957be2dc21f027..4833dfea43c393dc717518e45059ab1809cc6e66 100644
--- a/tracy/tracy/src/nsls-ii_lib.cc
+++ b/tracy/tracy/src/nsls-ii_lib.cc
@@ -1526,7 +1526,31 @@ void set_dL(const int Fnum, const int Knum, const double dL)
 
 
 // multipole components
-
+/*************************************************************
+void get_bn_design_elem(const int Fnum, const int Knum,
+			const int n, double &bn, double &an)
+			
+   Purpose:
+       Get the n-th order design value (bn, an) of the element
+       with family index "Fnum" and the kid number "Knum".
+       
+  Input:
+      Fnum:   family index
+      Knum:   kid index
+         n:   n-th design order of the element
+	bn:   bn component of the element
+	an:   an component of the element 
+
+ Output:
+    None
+    
+ Return:
+          bn, an
+	 
+ Comments:
+ 
+            11/2010 comments by jianfeng Zhang 
+**************************************************************/
 void get_bn_design_elem(const int Fnum, const int Knum,
 			const int n, double &bn, double &an)
 {