diff --git a/17/title.txt b/17/title.txt
index 63b437b0..b6d1e6a3 100644
--- a/17/title.txt
+++ b/17/title.txt
@@ -1 +1 @@
-chapter 17
\ No newline at end of file
+Chapter 17
\ No newline at end of file
diff --git a/18/title.txt b/18/title.txt
new file mode 100644
index 00000000..320dc88b
--- /dev/null
+++ b/18/title.txt
@@ -0,0 +1 @@
+Chapter 18
\ No newline at end of file
diff --git a/19/title.txt b/19/title.txt
index eb65c0c0..67890cbd 100644
--- a/19/title.txt
+++ b/19/title.txt
@@ -1 +1 @@
-CHAPTER 19
\ No newline at end of file
+Chapter 19
\ No newline at end of file
diff --git a/20/title.txt b/20/title.txt
new file mode 100644
index 00000000..b0df9c31
--- /dev/null
+++ b/20/title.txt
@@ -0,0 +1 @@
+Chapter 20
\ No newline at end of file
diff --git a/21/title.txt b/21/title.txt
deleted file mode 100644
index 7910b95c..00000000
--- a/21/title.txt
+++ /dev/null
@@ -1 +0,0 @@
-CHAPTER 21
\ No newline at end of file
diff --git a/manifest.json b/manifest.json
index e3dc0a55..5541b4e0 100644
--- a/manifest.json
+++ b/manifest.json
@@ -271,6 +271,7 @@
 		"15-33",
 		"15-36",
 		"15-39",
+		"16-title",
 		"16-01",
 		"16-04",
 		"16-06",
@@ -303,6 +304,7 @@
 		"17-28",
 		"17-30",
 		"17-32",
+		"18-title",
 		"18-01",
 		"18-04",
 		"18-07",
@@ -332,6 +334,7 @@
 		"19-33",
 		"19-35",
 		"19-38",
+		"20-title",
 		"20-01",
 		"20-04",
 		"20-07",
@@ -346,7 +349,6 @@
 		"20-31",
 		"20-33",
 		"20-36",
-		"21-title",
 		"21-01",
 		"21-03",
 		"21-05",