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diff --git a/src/options/arith_propagation_mode.cpp b/src/options/arith_propagation_mode.cpp
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+++ b/src/options/arith_propagation_mode.cpp
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+/*********************                                                        */
+/*! \file arith_propagation_mode.cpp
+ ** \verbatim
+ ** Original author: Morgan Deters
+ ** Major contributors: none
+ ** Minor contributors (to current version): none
+ ** This file is part of the CVC4 project.
+ ** Copyright (c) 2009-2014  New York University and The University of Iowa
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.\endverbatim
+ **
+ ** \brief [[ Add one-line brief description here ]]
+ **
+ ** [[ Add lengthier description here ]]
+ ** \todo document this file
+ **/
+
+#include "options/arith_propagation_mode.h"
+
+namespace CVC4 {
+
+std::ostream& operator<<(std::ostream& out, ArithPropagationMode mode) {
+  switch(mode) {
+  case NO_PROP:
+    out << "NO_PROP";
+    break;
+  case UNATE_PROP:
+    out << "UNATE_PROP";
+    break;
+  case BOUND_INFERENCE_PROP:
+    out << "BOUND_INFERENCE_PROP";
+    break;
+  case BOTH_PROP:
+    out << "BOTH_PROP";
+    break;
+  default:
+    out << "ArithPropagationMode!UNKNOWN";
+  }
+
+  return out;
+}
+
+}/* CVC4 namespace */