diff --git a/Chapter_3.Rmd b/Chapter_3.Rmd
index 1c9cab3..8e5ea89 100644
--- a/Chapter_3.Rmd
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@@ -1,7 +1,3 @@
----
-title: "Chapter 3"
----
-
 # Chapter 3
 
 Figure 3.5
diff --git a/Chapter_4.Rmd b/Chapter_4.Rmd
index c5a6b11..335fe90 100644
--- a/Chapter_4.Rmd
+++ b/Chapter_4.Rmd
@@ -1,5 +1 @@
----
-title: "Chapter 4"
----
-
 # Chapter 4
diff --git a/Chapter_5.Rmd b/Chapter_5.Rmd
index 191b69c..ca4f375 100644
--- a/Chapter_5.Rmd
+++ b/Chapter_5.Rmd
@@ -1,7 +1,3 @@
----
-title: "Chapter 5"
----
-
 # Chapter 5
 
 Figure 5.3
diff --git a/Chapter_6.Rmd b/Chapter_6.Rmd
index 6a0bc80..c26f7f0 100644
--- a/Chapter_6.Rmd
+++ b/Chapter_6.Rmd
@@ -1,7 +1,3 @@
----
-title: "Chapter 6"
----
-
 # Chapter 6
 
 CV transmission etc..
diff --git a/Chapter_8.Rmd b/Chapter_8.Rmd
index a5b4a06..7ec13bb 100644
--- a/Chapter_8.Rmd
+++ b/Chapter_8.Rmd
@@ -1,7 +1,3 @@
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-title: "Chapter 8"
----
-
 # Chapter 8
 
 ## Population size and highly skilled individuals
diff --git a/Chapter_9.Rmd b/Chapter_9.Rmd
index 84d8035..3d66a5c 100644
--- a/Chapter_9.Rmd
+++ b/Chapter_9.Rmd
@@ -1,7 +1,3 @@
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-title: "Chapter 9"
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-
 # Chapter 9
 
 Figure 9.13