diff --git a/registry/src/endpoints/package_version.rs b/registry/src/endpoints/package_version.rs
index 825ac12..7c27f53 100644
--- a/registry/src/endpoints/package_version.rs
+++ b/registry/src/endpoints/package_version.rs
@@ -71,7 +71,7 @@ pub async fn get_package_version(
 
     let (scope, name_part) = name.as_str();
 
-    let entries: IndexFile = {
+    let file: IndexFile = {
         let source = app_state.source.lock().await;
         let repo = gix::open(source.path(&app_state.project))?;
         let tree = root_tree(&repo)?;
@@ -84,14 +84,15 @@ pub async fn get_package_version(
 
     let Some((v_id, entry, targets)) = ({
         let version = match version {
-            VersionRequest::Latest => match entries.keys().map(|k| k.version()).max() {
+            VersionRequest::Latest => match file.entries.keys().map(|k| k.version()).max() {
                 Some(latest) => latest.clone(),
                 None => return Ok(HttpResponse::NotFound().finish()),
             },
             VersionRequest::Specific(version) => version,
         };
 
-        let versions = entries
+        let versions = file
+            .entries
             .iter()
             .filter(|(v_id, _)| *v_id.version() == version);
 
diff --git a/registry/src/endpoints/package_versions.rs b/registry/src/endpoints/package_versions.rs
index 4226807..93c8311 100644
--- a/registry/src/endpoints/package_versions.rs
+++ b/registry/src/endpoints/package_versions.rs
@@ -19,7 +19,7 @@ pub async fn get_package_versions(
 
     let (scope, name_part) = name.as_str();
 
-    let versions: IndexFile = {
+    let file: IndexFile = {
         let source = app_state.source.lock().await;
         let repo = gix::open(source.path(&app_state.project))?;
         let tree = root_tree(&repo)?;
@@ -32,7 +32,7 @@ pub async fn get_package_versions(
 
     let mut responses = BTreeMap::new();
 
-    for (v_id, entry) in versions {
+    for (v_id, entry) in file.entries {
         let info = responses
             .entry(v_id.version().clone())
             .or_insert_with(|| PackageResponse {
diff --git a/registry/src/endpoints/publish_version.rs b/registry/src/endpoints/publish_version.rs
index 42b21e2..eb1fadd 100644
--- a/registry/src/endpoints/publish_version.rs
+++ b/registry/src/endpoints/publish_version.rs
@@ -371,7 +371,7 @@ pub async fn publish_package(
             }
         };
 
-        let mut entries: IndexFile =
+        let mut file: IndexFile =
             toml::de::from_str(&read_file(&gix_tree, [scope, name])?.unwrap_or_default())?;
 
         let new_entry = IndexFileEntry {
@@ -386,11 +386,12 @@ pub async fn publish_package(
             dependencies,
         };
 
-        let this_version = entries
+        let this_version = file
+            .entries
             .keys()
             .find(|v_id| *v_id.version() == manifest.version);
         if let Some(this_version) = this_version {
-            let other_entry = entries.get(this_version).unwrap();
+            let other_entry = file.entries.get(this_version).unwrap();
 
             // description cannot be different - which one to render in the "Recently published" list?
             // the others cannot be different because what to return from the versions endpoint?
@@ -406,7 +407,8 @@ pub async fn publish_package(
             }
         }
 
-        if entries
+        if file
+            .entries
             .insert(
                 VersionId::new(manifest.version.clone(), manifest.target.kind()),
                 new_entry.clone(),
@@ -422,7 +424,7 @@ pub async fn publish_package(
         let reference = repo.find_reference(&refspec)?;
 
         {
-            let index_content = toml::to_string(&entries)?;
+            let index_content = toml::to_string(&file)?;
             let mut blob_writer = repo.blob_writer(None)?;
             blob_writer.write_all(index_content.as_bytes())?;
             oids.push((name, blob_writer.commit()?));
diff --git a/registry/src/endpoints/search.rs b/registry/src/endpoints/search.rs
index cb59eeb..0047a9d 100644
--- a/registry/src/endpoints/search.rs
+++ b/registry/src/endpoints/search.rs
@@ -68,10 +68,11 @@ pub async fn search_packages(
                 .unwrap();
             let (scope, name) = id.as_str();
 
-            let versions: IndexFile =
+            let file: IndexFile =
                 toml::de::from_str(&read_file(&tree, [scope, name]).unwrap().unwrap()).unwrap();
 
-            let (latest_version, entry) = versions
+            let (latest_version, entry) = file
+                .entries
                 .iter()
                 .max_by_key(|(v_id, _)| v_id.version())
                 .unwrap();
@@ -79,17 +80,19 @@ pub async fn search_packages(
             PackageResponse {
                 name: id.to_string(),
                 version: latest_version.version().to_string(),
-                targets: versions
+                targets: file
+                    .entries
                     .iter()
                     .filter(|(v_id, _)| v_id.version() == latest_version.version())
                     .map(|(_, entry)| (&entry.target).into())
                     .collect(),
                 description: entry.description.clone().unwrap_or_default(),
-                published_at: versions
+                published_at: file
+                    .entries
                     .values()
-                    .max_by_key(|entry| entry.published_at)
-                    .unwrap()
-                    .published_at,
+                    .map(|entry| entry.published_at)
+                    .max()
+                    .unwrap(),
                 license: entry.license.clone().unwrap_or_default(),
                 authors: entry.authors.clone(),
                 repository: entry.repository.clone().map(|url| url.to_string()),
diff --git a/registry/src/search.rs b/registry/src/search.rs
index bfcbba3..abb2419 100644
--- a/registry/src/search.rs
+++ b/registry/src/search.rs
@@ -104,7 +104,7 @@ pub async fn make_search(
     pin!(stream);
 
     while let Some((pkg_name, mut file)) = stream.next().await {
-        let Some((_, latest_entry)) = file.pop_last() else {
+        let Some((_, latest_entry)) = file.entries.pop_last() else {
             tracing::error!("no versions found for {pkg_name}");
             continue;
         };
diff --git a/src/source/pesde/mod.rs b/src/source/pesde/mod.rs
index 746eef6..0f4e89c 100644
--- a/src/source/pesde/mod.rs
+++ b/src/source/pesde/mod.rs
@@ -128,7 +128,7 @@ impl PackageSource for PesdePackageSource {
             }
         };
 
-        let entries: IndexFile = toml::from_str(&string)
+        let IndexFile { entries, .. } = toml::from_str(&string)
             .map_err(|e| Self::ResolveError::Parse(specifier.name.to_string(), e))?;
 
         tracing::debug!("{} has {} possible entries", specifier.name, entries.len());
@@ -432,8 +432,20 @@ pub struct IndexFileEntry {
     pub dependencies: BTreeMap<String, (DependencySpecifiers, DependencyType)>,
 }
 
+/// The package metadata in the index file
+#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq, Default)]
+pub struct IndexMetadata {}
+
 /// The index file for a package
-pub type IndexFile = BTreeMap<VersionId, IndexFileEntry>;
+#[derive(Debug, Serialize, Deserialize, Clone, PartialEq, Eq)]
+pub struct IndexFile {
+    /// Any package-wide metadata
+    #[serde(default, skip_serializing_if = "crate::util::is_default")]
+    pub meta: IndexMetadata,
+    /// The entries in the index file
+    #[serde(flatten)]
+    pub entries: BTreeMap<VersionId, IndexFileEntry>,
+}
 
 /// Errors that can occur when interacting with the pesde package source
 pub mod errors {
diff --git a/src/util.rs b/src/util.rs
index 3baca73..cb942d9 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -83,3 +83,7 @@ pub fn deserialize_git_like_url<'de, D: Deserializer<'de>>(
 pub fn hash<S: AsRef<[u8]>>(struc: S) -> String {
     format!("{:x}", Sha256::digest(struc.as_ref()))
 }
+
+pub fn is_default<T: Default + Eq>(t: &T) -> bool {
+    t == &T::default()
+}