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diff --git a/src/aig/int/int.h b/src/aig/int/int.h
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+/**CFile****************************************************************
+
+  FileName    [int.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Interpolation engine.]
+
+  Synopsis    [External declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 24, 2008.]
+
+  Revision    [$Id: int.h,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+ 
+#ifndef __INT_H__
+#define __INT_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* 
+    The interpolation algorithm implemented here was introduced in the paper:
+    K. L. McMillan. Interpolation and SAT-based model checking. CAV’03, pp. 1-13.
+*/
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+
+// simulation manager
+typedef struct Inter_ManParams_t_ Inter_ManParams_t;
+struct Inter_ManParams_t_
+{
+    int  nBTLimit;      // limit on the number of conflicts
+    int  nFramesMax;    // the max number timeframes to unroll
+    int  nFramesK;      // the number of timeframes to use in induction
+    int  fRewrite;      // use additional rewriting to simplify timeframes
+    int  fTransLoop;    // add transition into the init state under new PI var
+    int  fUsePudlak;    // use Pudluk interpolation procedure
+    int  fUseOther;     // use other undisclosed option
+    int  fUseMiniSat;   // use MiniSat-1.14p instead of internal proof engine
+    int  fCheckKstep;   // check using K-step induction
+    int  fUseBias;      // bias decisions to global variables
+    int  fUseBackward;  // perform backward interpolation
+    int  fVerbose;      // print verbose statistics
+};
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/*=== intCore.c ==========================================================*/
+extern void       Inter_ManSetDefaultParams( Inter_ManParams_t * p );
+extern int        Inter_ManPerformInterpolation( Aig_Man_t * pAig, Inter_ManParams_t * pPars, int * pDepth );
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+