diff --git a/README.md b/README.md
index b2d6ec48..4f1c3cc1 100644
--- a/README.md
+++ b/README.md
@@ -45,10 +45,15 @@ Creating HTML documentation:
     cd htmlgen
     python3 htmlgen.py
 
+(Re-)creating the database:
+
+    cd fuzzers
+    make -j$(nproc)
+
 (Re-)creating parts of the database, for example LUT init bits:
 
     cd fuzzers/010-lutinit
-    make
+    make -j$(nproc) run
 
 
 # Process
diff --git a/fuzzers/Makefile b/fuzzers/Makefile
index 48e0ad0a..cc84552a 100644
--- a/fuzzers/Makefile
+++ b/fuzzers/Makefile
@@ -1,13 +1,13 @@
 define fuzzer
 all:: $(1)/run.ok
 clean::
-	$(MAKE) -C $(1) clean
+	$$(MAKE) -C $(1) clean
 $(1)/run.ok: $(addsuffix /run.ok,$(2))
-	$(MAKE) -C $(1) run
+	$$(MAKE) -C $(1) run
 endef
 
 $(eval $(call fuzzer,001-part-yaml,))
-$(eval $(call fuzzer,005-tilegrid,))
+$(eval $(call fuzzer,005-tilegrid,001-part-yaml))
 $(eval $(call fuzzer,010-lutinit,005-tilegrid))
 $(eval $(call fuzzer,011-ffconfig,005-tilegrid))
 $(eval $(call fuzzer,012-clbn5ffmux,005-tilegrid))