diff --git a/LibAutomaton/matrix.h b/LibAutomaton/matrix.h
index 797f5c8..92aca29 100644
--- a/LibAutomaton/matrix.h
+++ b/LibAutomaton/matrix.h
@@ -64,17 +64,48 @@ cellElement * FindMatrixElem(Matrix matrix, int ColPos, int RowPos);
 *@param ColPos an int indicating the column of the cell
 *@param RowPos an int indicating the row of the cell
 *
-*@return void
+*@return a bool (error code)
 *
 */
 bool CreateMatrixElem(Matrix matrix, int ColPos, int RowPos);
 
+/**
+*Delete the cell in the given matrix
+*
+*@param matrix the Matrix 
+*@param ColPos an int indicating the column of the cell
+*@param RowPos an int indicating the row of the cell
+*
+*@return an error code (int)
+*
+*/
 int SupprMatrixElem(Matrix matrix, int ColPos, int RowPos);
 
+/**
+*Delete or create the cell in the given matrix to fit the value
+*
+*@param matrix the Matrix 
+*@param ColPos an int indicating the column of the cell
+*@param RowPos an int indicating the row of the cell
+*
+*@return an error code (bool)
+*
+*/
 bool SetCellValue(Matrix matrix, int ColPos, int RowPos, bool value);
 
+/**
+*Checks out the value of the cell in the given matrix
+*
+*@param matrix the Matrix 
+*@param ColPos an int indicating the column of the cell
+*@param RowPos an int indicating the row of the cell
+*
+*@return the value (bool)
+*
+*/
 bool GetCellValue(Matrix matrix, int ColPos, int RowPos);
 
+
 Matrix SetMatrixDim(Matrix matrix,int nbCols,int nbRows);
 
 void BasicPrintMatrix(Matrix matrix);