diff --git a/src/components/PostControls/util.ts b/src/components/PostControls/util.ts
index 2997817cac..5d3ea74e49 100644
--- a/src/components/PostControls/util.ts
+++ b/src/components/PostControls/util.ts
@@ -1,5 +1,10 @@
 import {type I18n} from '@lingui/core'
 
+/**
+ * This matches `formatCount` from `view/com/util/numeric/format.ts`, but has
+ * additional truncation logic for large numbers. `roundingMode` should always
+ * match the original impl, regardless of if we add more formatting here.
+ */
 export function formatPostStatCount(
   i18n: I18n,
   count: number,