1 files changed, 8 insertions, 3 deletions
diff --git a/src/Bitmap_cubical_complex/doc/Gudhi_Cubical_Complex_doc.h b/src/Bitmap_cubical_complex/doc/Gudhi_Cubical_Complex_doc.h
index d1836ef0..5fa02a5e 100644
--- a/src/Bitmap_cubical_complex/doc/Gudhi_Cubical_Complex_doc.h
+++ b/src/Bitmap_cubical_complex/doc/Gudhi_Cubical_Complex_doc.h
@@ -87,11 +87,16 @@ namespace cubical_complex {
  *
  * \section inputformat Input Format
  *
- * In the current implantation, filtration is given at the maximal cubes, and it is then extended by the lower star
+ * In the current implementation, filtration is given at the maximal cubes, and it is then extended by the lower star
  * filtration to all cubes. There are a number of constructors that can be used to construct cubical complex by users
  * who want to use the code directly. They can be found in the \a Bitmap_cubical_complex class.
- * Currently one input from a text file is used. It uses a format used already in Perseus software
- * (http://www.sas.upenn.edu/~vnanda/perseus/) by Vidit Nanda. The file format is described here: \ref FileFormatsPerseus.
+ * Currently one input from a text file is used. It uses a format inspired from the Perseus software
+ * (http://www.sas.upenn.edu/~vnanda/perseus/) by Vidit Nanda.
+ * \note While Perseus assume the filtration of all maximal cubes to be non-negative, over here we do not enforce this
+ * and we allow any filtration values. As a consequence one cannot use `-1`'s to indicate missing cubes. If you have
+ * missing cubes in your complex, please set their filtration to \f$+\infty\f$ (aka. `inf` in the file).
+ *
+ * The file format is described in details in \ref FileFormatsPerseus file format section.
  *
  * \section PeriodicBoundaryConditions Periodic boundary conditions
  * Often one would like to impose periodic boundary conditions to the cubical complex. Let \f$ I_1\times ... \times