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diff --git a/src/theory/arith/arith_heuristic_pivot_rule.cpp b/src/theory/arith/arith_heuristic_pivot_rule.cpp
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+/*********************                                                        */
+/*! \file arith_heuristic_pivot_rule.cpp
+ ** \verbatim
+ ** Original author: mdeters
+ ** Major contributors: none
+ ** Minor contributors (to current version): none
+ ** This file is part of the CVC4 prototype.
+ ** Copyright (c) 2009-2012  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.\endverbatim
+ **
+ ** \brief [[ Add one-line brief description here ]]
+ **
+ ** [[ Add lengthier description here ]]
+ ** \todo document this file
+ **/
+
+#include "theory/arith/arith_heuristic_pivot_rule.h"
+
+namespace CVC4 {
+
+std::ostream& operator<<(std::ostream& out, ArithHeuristicPivotRule rule) {
+  switch(rule) {
+  case MINIMUM:
+    out << "MINIMUM";
+    break;
+  case BREAK_TIES:
+    out << "BREAK_TIES";
+    break;
+  case MAXIMUM:
+    out << "MAXIMUM";
+    break;
+  default:
+    out << "ArithHeuristicPivotRule!UNKNOWN";
+  }
+
+  return out;
+}
+
+}/* CVC4 namespace */
+