diff --git a/pdf/short_build_book b/pdf/short_build_book
index 270711b..9b59b5b 100755
--- a/pdf/short_build_book
+++ b/pdf/short_build_book
@@ -2,7 +2,7 @@
 
 echo "merging book..."
 
-python short_merge_book.py > short.ipynb
+ipython short_merge_book.py > short.ipynb
 
 echo "creating pdf..."
 ipython nbconvert --to latex --template book --post PDF short.ipynb
diff --git a/pdf/short_merge_book.py b/pdf/short_merge_book.py
index f7057db..d9c39d3 100644
--- a/pdf/short_merge_book.py
+++ b/pdf/short_merge_book.py
@@ -58,8 +58,5 @@ def merge_notebooks(filenames):
 if __name__ == '__main__':
     #merge_notebooks(sys.argv[1:])
     merge_notebooks(
-        ['Preface.ipynb',
-         '01_gh_filter/g-h_filter.ipynb',
-         '02_Discrete_Bayes/discrete_bayes.ipynb',
-         'Appendix_A_Installation/Appendix_Installation.ipynb',
-         'Appendix_B_Symbols_and_Notations/Appendix_Symbols_and_Notations.ipynb'])
+        ['../01_g-h_filter.ipynb',
+         '../02_Discrete_Bayes.ipynb'])