diff --git a/x-pack/plugins/security_solution/server/search_strategy/timeline/factory/events/details/helpers.ts b/x-pack/plugins/security_solution/server/search_strategy/timeline/factory/events/details/helpers.ts
index baa9e0c504deca..a0ec0b77c6422c 100644
--- a/x-pack/plugins/security_solution/server/search_strategy/timeline/factory/events/details/helpers.ts
+++ b/x-pack/plugins/security_solution/server/search_strategy/timeline/factory/events/details/helpers.ts
@@ -111,6 +111,8 @@ export const getDataFromFieldsHits = (
     const flat = [...accumulator, ...nestedFields].reduce(
       (acc, f) => ({
         ...acc,
+        // acc is hashmap to determine if we already have the field or not without an array iteration
+        // its converted back to array in return with Object.values
         ...(acc[f.field] != null
           ? {
               [f.field]: {