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diff --git a/src/smt/cnf_conversion.h b/src/smt/cnf_conversion.h
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+++ b/src/smt/cnf_conversion.h
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+/*********************                                           -*- C++ -*-  */
+/** cnf_conversion.h
+ ** Original author: mdeters
+ ** Major contributors: dejan
+ ** Minor contributors (to current version): none
+ ** This file is part of the CVC4 prototype.
+ ** Copyright (c) 2009 The Analysis of Computer Systems Group (ACSys)
+ ** Courant Institute of Mathematical Sciences
+ ** New York University
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.
+ **
+ ** A type for describing possible CNF conversions.
+ **/
+
+#ifndef __CVC4__CNF_CONVERSION_H
+#define __CVC4__CNF_CONVERSION_H
+
+namespace CVC4 {
+
+enum CnfConversion {
+  CNF_DIRECT_EXPONENTIAL = 0,
+  CNF_VAR_INTRODUCTION = 1
+};
+
+inline std::ostream& operator<<(std::ostream&, CVC4::CnfConversion) CVC4_PUBLIC;
+inline std::ostream& operator<<(std::ostream& out, CVC4::CnfConversion c) {
+  using namespace CVC4;
+
+  switch(c) {
+  case CNF_DIRECT_EXPONENTIAL:
+    out << "CNF_DIRECT_EXPONENTIAL";
+    break;
+  case CNF_VAR_INTRODUCTION:
+    out << "CNF_VAR_INTRODUCTION";
+    break;
+  default:
+    out << "UNKNOWN-CONVERTER!" << int(c);
+  }
+
+  return out;
+}
+
+}/* CVC4 namespace */
+
+#endif /* __CVC4__CNF_CONVERSION_H */