diff --git a/crates/diffguard-types/src/lib.rs b/crates/diffguard-types/src/lib.rs
index b634c06b..38bdc860 100644
--- a/crates/diffguard-types/src/lib.rs
+++ b/crates/diffguard-types/src/lib.rs
@@ -245,6 +245,10 @@ impl ConfigFile {
     ///
     /// Rules are loaded from `rules/built_in.json` at compile time via `include_str!`.
     /// This ensures the JSON is embedded in the binary and avoids any I/O at runtime.
+    ///
+    /// # Panics
+    ///
+    /// Panics if `built_in.json` cannot be parsed as valid JSON.
     #[must_use]
     pub fn built_in() -> Self {
         serde_json::from_str(include_str!("rules/built_in.json"))