diff --git a/crates/typst-docs/src/contribs.rs b/crates/typst-docs/src/contribs.rs
index 901b5f69e..cbd87dc6d 100644
--- a/crates/typst-docs/src/contribs.rs
+++ b/crates/typst-docs/src/contribs.rs
@@ -2,7 +2,7 @@ use std::cmp::Reverse;
 use std::collections::HashMap;
 use std::fmt::Write;
 
-use serde::Deserialize;
+use serde::{Deserialize, Serialize};
 
 use super::{Html, Resolver};
 
@@ -73,13 +73,13 @@ struct Contributor {
 }
 
 /// A commit on the `typst` repository.
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Serialize, Deserialize)]
 pub struct Commit {
     author: Author,
 }
 
 /// A commit author.
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Serialize, Deserialize)]
 pub struct Author {
     login: String,
     avatar_url: String,
diff --git a/crates/typst-docs/src/html.rs b/crates/typst-docs/src/html.rs
index 0d40f46ba..4cbf5661f 100644
--- a/crates/typst-docs/src/html.rs
+++ b/crates/typst-docs/src/html.rs
@@ -446,7 +446,8 @@ fn code_block(resolver: &dyn Resolver, lang: &str, text: &str) -> Html {
         frames.truncate(1);
     }
 
-    resolver.example(highlighted, &frames)
+    let hash = typst::util::hash128(text);
+    resolver.example(hash, highlighted, &frames)
 }
 
 /// Extract an attribute value from an HTML element.
diff --git a/crates/typst-docs/src/lib.rs b/crates/typst-docs/src/lib.rs
index 1aabebf02..4f2c72b7d 100644
--- a/crates/typst-docs/src/lib.rs
+++ b/crates/typst-docs/src/lib.rs
@@ -73,7 +73,7 @@ pub trait Resolver {
     fn image(&self, filename: &str, data: &[u8]) -> String;
 
     /// Produce HTML for an example.
-    fn example(&self, source: Html, frames: &[Frame]) -> Html;
+    fn example(&self, hash: u128, source: Html, frames: &[Frame]) -> Html;
 
     /// Determine the commits between two tags.
     fn commits(&self, from: &str, to: &str) -> Vec<Commit>;
@@ -988,7 +988,7 @@ mod tests {
             None
         }
 
-        fn example(&self, _: Html, _: &[Frame]) -> Html {
+        fn example(&self, _: u128, _: Html, _: &[Frame]) -> Html {
             Html::new(String::new())
         }