diff --git a/04/01.txt b/04/01.txt
new file mode 100644
index 0000000..1021c5b
--- /dev/null
+++ b/04/01.txt
@@ -0,0 +1 @@
+\c 4 1 
\ No newline at end of file
diff --git a/manifest.json b/manifest.json
index 05d547c..95166df 100644
--- a/manifest.json
+++ b/manifest.json
@@ -72,6 +72,7 @@
 		"03-12",
 		"03-15",
 		"03-17",
+		"03-20",
 		"04-title",
 		"04-18",
 		"04-21"