diff --git a/banking_breakdown/document_builder.py b/banking_breakdown/document_builder.py
index 23ed8fd..f223266 100644
--- a/banking_breakdown/document_builder.py
+++ b/banking_breakdown/document_builder.py
@@ -4,19 +4,20 @@ import shutil
 from banking_breakdown import types
 
 
-def build_document(report_data: types.ReportData):
-    # Copy files from 'res/' folder
+def _copy_resources():
     os.makedirs(os.path.dirname("build/report.tex"), exist_ok=True)
     shutil.copyfile("res/report.tex", "build/report.tex")
     shutil.copyfile("res/.latexmkrc", "build/.latexmkrc")
 
-    # Write data as csv files
+
+def _serialize_report_data(report_data: types.ReportData):
     report_data.net_income.to_csv('build/net_income.csv', index=False)
     report_data.category_overview.to_csv('build/category_overview.csv',
                                          index=False)
     report_data.total_value.to_csv('build/total_value.csv', index=False)
 
-    # Build dockerfile and compile document
+
+def _compile_document():
     subprocess.call("docker build . -f res/Dockerfile.alpine"
                     " -t banking-breakdown",
                     shell=True)
@@ -25,3 +26,9 @@ def build_document(report_data: types.ReportData):
                     " -w /project/build banking-breakdown"
                     " latexmk -pdf report.tex",
                     shell=True)
+
+
+def build_document(report_data: types.ReportData):
+    _copy_resources()
+    _serialize_report_data(report_data)
+    _compile_document()