diff --git a/merge_book.py b/merge_book.py
index d1d603a..9d22ea9 100644
--- a/merge_book.py
+++ b/merge_book.py
@@ -33,19 +33,19 @@ if __name__ == '__main__':
     #merge_notebooks(sys.argv[1:])
     merge_notebooks(
         ['Preface.ipynb',
-         'g-h_filter.ipynb',
-         'discrete_bayes.ipynb',
-         'Least_Squares_Filters.ipynb',
-         'Gaussians.ipynb',
-         'Kalman_Filters.ipynb',
-         'Multivariate_Kalman_Filters.ipynb',
-         'Kalman_Filter_Math.ipynb',
-         'Designing_Kalman_Filters.ipynb',
-         'Extended_Kalman_Filters.ipynb',
-         'Unscented_Kalman_Filter.ipynb',
-         'Designing_Nonlinear_Kalman_Filters.ipynb',
-         'Appendix_Installation.ipynb',
-         'Appendix_Symbols_and_Notations.ipynb'])
+         'Chapter01_gh_filter/g-h_filter.ipynb',
+         'Chapter02_Discrete_Bayes/discrete_bayes.ipynb',
+         'Chapter03_Least_Squares/Least_Squares_Filters.ipynb',
+         'Chapter04_Gaussians/Gaussians.ipynb',
+         'Chapter05_Kalman_Filters/Kalman_Filters.ipynb',
+         'Chapter06_Multivariate_Kalman_Filter/Multivariate_Kalman_Filters.ipynb',
+         'Chapter07_Kalman_Filter_Math/Kalman_Filter_Math.ipynb',
+         'Chapter08_Designing_Kalman_Filters/Designing_Kalman_Filters.ipynb',
+         'Chapter09_Extended_Kalman_Filters/Extended_Kalman_Filters.ipynb',
+         'Chapter10_Unscented_Kalman_Filters/Unscented_Kalman_Filter.ipynb',
+         'Chapter11_Designing_Nonlinear_Kalman_Filters/Designing_Nonlinear_Kalman_Filters.ipynb',
+         'Appendix_A_Installation/Appendix_Installation.ipynb',
+         'Appendix_B_Symbols_and_Notations/Appendix_Symbols_and_Notations.ipynb'])
 
 
 #    merge_notebooks(['Preface.ipynb', g-h_filter.ipynb discrete_bayes.ipynb Gaussians.ipynb Kalman_Filters.ipynb Multivariate_Kalman_Filters.ipynb Kalman_Filter_Math.ipynb Designing_Kalman_Filters.ipynb Extended_Kalman_Filters.ipynb Unscented_Kalman_Filter.ipynb'])