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diff --git a/src/Witness_complex/include/gudhi/Witness_complex/all_faces_in.h b/src/Witness_complex/include/gudhi/Witness_complex/all_faces_in.h
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+++ b/src/Witness_complex/include/gudhi/Witness_complex/all_faces_in.h
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+/*    This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
+ *    See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
+ *    Author(s):       Siargey Kachanovich
+ *
+ *    Copyright (C) 2015 Inria
+ *
+ *    Modification(s):
+ *      - YYYY/MM Author: Description of the modification
+ */
+
+#ifndef WITNESS_COMPLEX_ALL_FACES_IN_H_
+#define WITNESS_COMPLEX_ALL_FACES_IN_H_
+
+/* \brief Check if the facets of the k-dimensional simplex witnessed 
+ *  by witness witness_id are already in the complex.
+ *  inserted_vertex is the handle of the (k+1)-th vertex witnessed by witness_id
+ */
+template < typename SimplicialComplexForWitness,
+           typename Simplex >
+  bool all_faces_in(Simplex& simplex,
+                    double* filtration_value,
+                    SimplicialComplexForWitness& sc) {
+    typedef typename SimplicialComplexForWitness::Simplex_handle Simplex_handle;
+
+    if (simplex.size() == 1)
+      return true;                  /* Add vertices unconditionally */
+
+    Simplex facet;
+    for (typename Simplex::iterator not_it = simplex.begin(); not_it != simplex.end(); ++not_it) {
+        facet.clear();
+        for (typename Simplex::iterator it = simplex.begin(); it != simplex.end(); ++it)
+          if (it != not_it)
+            facet.push_back(*it);
+        Simplex_handle facet_sh = sc.find(facet);
+        if (facet_sh == sc.null_simplex())
+          return false;
+        else if (sc.filtration(facet_sh) > *filtration_value)
+          *filtration_value = sc.filtration(facet_sh);
+      }
+    return true;
+  }
+
+#endif  // WITNESS_COMPLEX_ALL_FACES_IN_H_