diff --git a/quickwit/quickwit-indexing/src/merge_policy/mod.rs b/quickwit/quickwit-indexing/src/merge_policy/mod.rs
index 75e405294aa..86e5098a4b2 100644
--- a/quickwit/quickwit-indexing/src/merge_policy/mod.rs
+++ b/quickwit/quickwit-indexing/src/merge_policy/mod.rs
@@ -108,8 +108,10 @@ impl fmt::Debug for MergeOperation {
 pub trait MergePolicy: Send + Sync + fmt::Debug {
     /// Returns the list of merge operations that should be performed.
     fn operations(&self, splits: &mut Vec<SplitMetadata>) -> Vec<MergeOperation>;
-    /// Returns split maturity after which a split becomes mature.
-    /// A split is mature if it does not undergo new merge operations.
+    /// Returns split maturity.
+    /// A split is either:
+    /// - `Mature` if it does not undergo new merge operations.
+    /// - will become mature after a `TimeToMaturity` period of time.
     fn split_maturity(&self, split_num_docs: usize, split_num_merge_ops: usize) -> SplitMaturity;
 
     /// Checks a bunch of properties specific to the given merge policy.
diff --git a/quickwit/quickwit-metastore/src/split_metadata.rs b/quickwit/quickwit-metastore/src/split_metadata.rs
index cd772971014..7a1cd0951f9 100644
--- a/quickwit/quickwit-metastore/src/split_metadata.rs
+++ b/quickwit/quickwit-metastore/src/split_metadata.rs
@@ -168,10 +168,10 @@ impl SplitMetadata {
     }
 
     /// Returns the unix timestamp at which the split becomes mature.
-    /// Not that if the split is mature `SplitMaturity::Mature`, we return 0.
-    /// This is handy only for metastore implementations where we want to filter
-    /// out splits that are not mature yet and/or for persisting the maturity
-    /// timestamp in a database.
+    /// If the split is mature (`SplitMaturity::Mature`), we return 0.
+    /// This is handy only for metastore implementations that need to filter
+    /// on split maturity and/or for persisting the maturity timestamp
+    /// in a database.
     pub(crate) fn maturity_timestamp(&self) -> i64 {
         match self.maturity {
             SplitMaturity::Mature => 0,
@@ -272,10 +272,10 @@ impl FromStr for SplitState {
     }
 }
 
-/// Split maturity is determined by the `MergePolicy`. Once a split is mature,
-/// it does not undergo new merge operations.
+/// A split is mature if it does not undergo new merge operations.
 /// A split is either `Mature` or becomes mature after a given period, aka
 /// `TimeToMaturity`.
+/// The maturity is determined by the `MergePolicy`.
 #[derive(Clone, Copy, Debug, Default, Eq, Serialize, Deserialize, PartialEq)]
 #[serde(untagged)]
 pub enum SplitMaturity {