diff --git a/milli/src/update/index_documents/extract/extract_facet_string_docids.rs b/milli/src/update/index_documents/extract/extract_facet_string_docids.rs
index fd5949fd9..45a7696ac 100644
--- a/milli/src/update/index_documents/extract/extract_facet_string_docids.rs
+++ b/milli/src/update/index_documents/extract/extract_facet_string_docids.rs
@@ -269,16 +269,36 @@ fn extract_facet_string_docids_settings<R: io::Read + io::Seek>(
 }
 
 /// Normalizes the facet string and truncates it to the max length.
+#[tracing::instrument(level = "trace", skip_all, target = "indexing::extract")]
 fn normalize_facet_string(facet_string: &str, locales: Option<&[Language]>) -> String {
     let options = NormalizerOption { lossy: true, ..Default::default() };
     let mut detection = StrDetection::new(facet_string, locales);
+
+    let script = {
+        let span = tracing::trace_span!(target: "indexing::extract::extract_facet_string_docids", "detect_script");
+        let _entered = span.enter();
+
+        detection.script()
+    };
+
+    let language = {
+        let span = tracing::trace_span!(target: "indexing::extract::extract_facet_string_docids", "detect_language");
+        let _entered = span.enter();
+
+        detection.language()
+    };
+
     let token = Token {
         lemma: std::borrow::Cow::Borrowed(facet_string),
-        script: detection.script(),
-        language: detection.language(),
+        script,
+        language,
         ..Default::default()
     };
 
+    let span =
+        tracing::trace_span!(target: "indexing::extract::extract_facet_string_docids", "normalize");
+    let _entered = span.enter();
+
     // truncate the facet string to the max length
     token
         .normalize(&options)