diff --git a/AstroLib/Include/AsAttitudeParam.h b/AstroLib/Include/AsAttitudeParam.h
index b199c9e81e45f97b8a2856a129eb354577830797..fa9da2b818c1c034ae1d0e946372a90018d61cf4 100644
--- a/AstroLib/Include/AsAttitudeParam.h
+++ b/AstroLib/Include/AsAttitudeParam.h
@@ -1,4 +1,4 @@
-////////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////
 //                                                                        //
 //                       Copyright (c) 2003-2008                          //
 //                              Wang Hua                                  //
@@ -406,3 +406,4 @@ inline const CEuler AsRadToDeg(CEuler rad)
 
 
 #endif // !defined(_ASATTITUDEPARAM_H_)
+void AsQuatToEuler312(const CQuaternion& quat, CEuler& euler);
\ No newline at end of file