diff --git a/Makefile b/Makefile
index d2ffa64..fde449e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,22 +1,27 @@
 SHELL = /bin/sh
 .SUFFIXES:
 
+# All notes referenced with internal links, starting from `index.md`.
 NOTES = $(shell pandoc lua pandoc/collect_notes.lua index.md)
-TARGETS = $(patsubst %.md,public_html/%.html,$(NOTES))
-GETDEPS = $(patsubst %.md,public_html/%.html.part,$(shell pandoc lua pandoc/collect_links.lua $(1)))
-DEPSMETAFLAGS = $(patsubst %,-M linkparts=%,$(filter-out $<,$^))
+# All pages referenced with internal links, starting from `index.md`.
+PAGES := $(patsubst %.md,public_html/%.html,$(NOTES))
+# All parts referenced with internal links in `$(1)`, plus the sitemap.
+PARTS = $(patsubst %.md,public_html/%.html.part,$(shell pandoc lua pandoc/collect_links.lua $(1))) public_html/sitemap.html.part
+
+PANDOCFLAGS = --data-dir pandoc
 
 .PHONY: all
-all: $(TARGETS)
+all: $(PAGES)
 
 .SECONDEXPANSION:
-public_html/%.html: %.md \
-										$$(call GETDEPS,%.md) \
-										public_html/sitemap.html.part
-	pandoc --data-dir pandoc -d bavbavhaus.net.yaml -M slug=$* $(DEPSMETAFLAGS) -o $@ $<
+public_html/%.html: flags = $(patsubst %,-M parts=%,$(filter-out $<,$^))
+public_html/%.html: %.md $$(call PARTS,%.md)
+	@echo $^
+	pandoc $(PANDOCFLAGS) -d bavbavhaus.net.yaml -M slug=$* $(flags) -o $@ $<
 
+.SECONDARY:
 public_html/%.html.part: %.md
-	pandoc --data-dir pandoc -d bavbavhaus.net.part.yaml --id-prefix $* -M url=$*.html -M slug=$* -o $@ $<
+	pandoc $(PANDOCFLAGS) -d bavbavhaus.net.part.yaml --id-prefix $* -M url=$*.html -M slug=$* -o $@ $<
 
 public_html/sitemap.html.part: $(NOTES)
 	pandoc lua pandoc/sitemap.lua index.md $@