diff --git a/src/mito2/src/cache/file_cache.rs b/src/mito2/src/cache/file_cache.rs
index a0beb83bcb1d..843cb63eaa2e 100644
--- a/src/mito2/src/cache/file_cache.rs
+++ b/src/mito2/src/cache/file_cache.rs
@@ -96,9 +96,9 @@ impl FileCache {
         }
     }
 
-    /// Puts a file into the cache.
+    /// Puts a file into the cache index.
     ///
-    /// Callers should ensure the file is in the correct path.
+    /// The `WriteCache` should ensure the file is in the correct path.
     pub(crate) async fn put(&self, key: IndexKey, value: IndexValue) {
         CACHE_BYTES
             .with_label_values(&[FILE_TYPE])