diff --git a/sources/reactphysics3d/mathematics/constants.h b/sources/reactphysics3d/mathematics/constants.h
new file mode 100644
index 00000000..43bfba1e
--- /dev/null
+++ b/sources/reactphysics3d/mathematics/constants.h
@@ -0,0 +1,29 @@
+/****************************************************************************
+ * Copyright (C) 2009      Daniel Chappuis                                  *
+****************************************************************************
+* This file is part of ReactPhysics3D.                                     *
+*                                                                          *
+* ReactPhysics3D is free software: you can redistribute it and/or modify   *
+* it under the terms of the GNU General Public License as published by     *
+* the Free Software Foundation, either version 3 of the License, or        *
+* (at your option) any later version.                                      *
+*                                                                          *
+* ReactPhysics3D is distributed in the hope that it will be useful,        *
+* but WITHOUT ANY WARRANTY; without even the implied warranty of           *
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the             *
+* GNU General Public License for more details.                             *
+*                                                                          *
+* You should have received a copy of the GNU General Public License        *
+* along with ReactPhysics3D. If not, see <http://www.gnu.org/licenses/>.   *
+***************************************************************************/
+
+#ifndef CONSTANTS_H
+#define CONSTANTS_H
+
+// Constant used for the precision
+const double epsilon = 0.00001;
+
+// Pi constant
+const double pi = 3.14159265;
+
+#endif
diff --git a/sources/reactphysics3d/mathematics/mathematics.h b/sources/reactphysics3d/mathematics/mathematics.h
index 716a89f9..48f8fc60 100644
--- a/sources/reactphysics3d/mathematics/mathematics.h
+++ b/sources/reactphysics3d/mathematics/mathematics.h
@@ -28,6 +28,7 @@
 #include "Quaternion.h"
 #include "Vector.h"
 #include "Vector3D.h"
+#include "constants.h"
 #include "exceptions.h"
 
 #endif