diff --git a/Makefile b/Makefile
index b742818..425e843 100644
--- a/Makefile
+++ b/Makefile
@@ -47,6 +47,18 @@ build-stage:
 	@echo "Merging style files into the staging directory"
 	@rsync -av $(STYLEDIR)/ $(STAGINGDIR)/style --quiet
 
+    # Prüfen auf Dateien mit Unterstrichen im Namen
+	@echo "Checking for files containing underscores in $(STAGINGDIR)..."
+	@files=$$(find $(STAGINGDIR) -type f -name '*_*'); \
+	if [ -n "$$files" ]; then \
+		echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"; \
+		echo "WARNING: Found files with underscores:"; \
+		echo " ->  $$files"; \
+		echo "These files are very likely to cause issues during the build process"; \
+		echo "Remove or rename them to build the thesis safely"; \
+		echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"; \
+	fi
+
 compile-output:
     # Bauen der Arbeit aus dem staging verzeichnis heraus
 	@echo "Compiling the thesis into: $(OUTPUTFILE)"
diff --git a/example/31-ausarbeitung_schueler1.md b/example/31-ausarbeitung-schueler1.md
similarity index 100%
rename from example/31-ausarbeitung_schueler1.md
rename to example/31-ausarbeitung-schueler1.md
diff --git a/example/32-ausarbeitung_schueler2.md b/example/32-ausarbeitung-schueler2.md
similarity index 100%
rename from example/32-ausarbeitung_schueler2.md
rename to example/32-ausarbeitung-schueler2.md
diff --git a/example/doc/HTLLEDiplomarbeitsidee_NAME1_NAME2.xlsx b/example/doc/HTLLEDiplomarbeitsidee-NAME1-NAME2.xlsx
similarity index 100%
rename from example/doc/HTLLEDiplomarbeitsidee_NAME1_NAME2.xlsx
rename to example/doc/HTLLEDiplomarbeitsidee-NAME1-NAME2.xlsx
diff --git a/example/doc/VorlageDA-Präsentation2020_Erstpräsentation.pptx b/example/doc/VorlageDA-Präsentation-NAME.pptx
similarity index 100%
rename from example/doc/VorlageDA-Präsentation2020_Erstpräsentation.pptx
rename to example/doc/VorlageDA-Präsentation-NAME.pptx
diff --git a/example/doc/VorlagePoster(A0)_2016.ppt b/example/doc/VorlagePoster(A0).ppt
similarity index 100%
rename from example/doc/VorlagePoster(A0)_2016.ppt
rename to example/doc/VorlagePoster(A0).ppt