diff --git a/21/06.txt b/21/06.txt
new file mode 100644
index 0000000..89adf70
--- /dev/null
+++ b/21/06.txt
@@ -0,0 +1 @@
+Ya
\ No newline at end of file
diff --git a/manifest.json b/manifest.json
index 093abf5..c30481f 100644
--- a/manifest.json
+++ b/manifest.json
@@ -75,6 +75,7 @@
 		"17-16",
 		"21-title",
 		"21-01",
-		"21-03"
+		"21-03",
+		"21-04"
 	]
 }
\ No newline at end of file