diff --git a/Makefile b/Makefile
index 01ce3a2..5e49452 100644
--- a/Makefile
+++ b/Makefile
@@ -19,7 +19,7 @@ ENGINE ?= pdflatex
 %: builddir% notes% zip%
 	@echo 'Done.'
 
-all: clean outline 01 02 03 04 05 06 07 08 09 10 11 12
+all: clean outline 01 02 03 04 05 06 07 08 09 10 11 12 13
 	@
 
 outline: builddir%