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diff --git a/src/cml/mathlib/epsilon.h b/src/cml/mathlib/epsilon.h
new file mode 100644
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+++ b/src/cml/mathlib/epsilon.h
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+/* -*- C++ -*- ------------------------------------------------------------
+ 
+Copyright (c) 2007 Jesse Anders and Demian Nave http://cmldev.net/
+
+The Configurable Math Library (CML) is distributed under the terms of the
+Boost Software License, v1.0 (see cml/LICENSE for details).
+
+ *-----------------------------------------------------------------------*/
+/** @file
+ *  @brief
+ */
+
+#ifndef epsilon_h
+#define epsilon_h
+
+namespace cml {
+
+/* @todo: epsilon and tolerance handling.
+ *
+ * @note This is a placeholder for a more sophisticated epsilon/tolerance
+ * system.
+ */
+
+template < typename Real >
+struct epsilon
+{
+    typedef Real value_type;
+    
+private:
+
+    /** For convenience */
+    typedef value_type T;
+    
+public:
+
+    static T placeholder() {
+        /* Completely arbitrary placeholder value: */
+        return T(0.0001);
+    }
+};
+
+} // namespace cml
+
+#endif