diff --git a/Makefile b/Makefile
index a5b6899..9862055 100644
--- a/Makefile
+++ b/Makefile
@@ -1,11 +1,19 @@
-all:
-	mkdir -p build/build
+.PHONY: all
+all: build/prepared build/presentation_template.pdf build/presentation_2025-11-07.pdf
 
+build/presentation_template.pdf:
 	TEXINPUTS=./lib/cel-slides-template-2025:$$TEXINPUTS latexmk src/template/presentation.tex
-	mv build/presentation.pdf build/presentation_template.pdf
+	mv build/presentation.pdf $@
 
+build/presentation_2025-11-07.pdf:
 	TEXINPUTS=./lib/cel-slides-template-2025:$$TEXINPUTS latexmk src/2025-11-07/presentation.tex
-	mv build/presentation.pdf build/presentation_2025-11-07.pdf
+	mv build/presentation.pdf $@
+
+build/prepared:
+	mkdir -p build build
+	touch build/prepared
+
+.PHONY: clean
 clean:
 	rm -rf build