diff --git a/.gitignore b/.gitignore
index 0c45146..6d48c4f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,6 +6,7 @@ _main.rds
 _book
 *.md
 *.html
+!ga_script.html
 search_index.json
 libs
 *.rds
diff --git a/_output.yaml b/_output.yaml
index a82ee78..3a8bc66 100644
--- a/_output.yaml
+++ b/_output.yaml
@@ -1,4 +1,6 @@
 bookdown::gitbook:
+  includes:
+    in_header: [ga_script.html]
   config:
     toc:
       collapse: section
diff --git a/ga_script.html b/ga_script.html
new file mode 100644
index 0000000..665931a
--- /dev/null
+++ b/ga_script.html
@@ -0,0 +1,9 @@
+<!-- Global site tag (gtag.js) - Google Analytics -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=UA-115082821-1"></script>
+<script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments);}
+  gtag('js', new Date());
+
+  gtag('config', 'UA-115082821-1');
+</script>