diff --git a/crates/milli/src/prompt/mod.rs b/crates/milli/src/prompt/mod.rs
index 8fcdce5ad..04556940c 100644
--- a/crates/milli/src/prompt/mod.rs
+++ b/crates/milli/src/prompt/mod.rs
@@ -167,6 +167,7 @@ fn truncate(s: &mut String, max_bytes: usize) {
     }
 }
 
+/// Build the liquid objects corresponding to the `doc` and `fields` object of a [`Prompt`] from the given external document id.
 pub fn get_document(
     index: &Index,
     rtxn: &RoTxn<'_>,