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-rw-r--r--tvix/castore/src/directoryservice/mod.rs5
1 files changed, 4 insertions, 1 deletions
diff --git a/tvix/castore/src/directoryservice/mod.rs b/tvix/castore/src/directoryservice/mod.rs
index 8a10121d6d88..ca8e60e87304 100644
--- a/tvix/castore/src/directoryservice/mod.rs
+++ b/tvix/castore/src/directoryservice/mod.rs
@@ -44,7 +44,10 @@ pub trait DirectoryService: Send + Sync {
     /// Rust doesn't support this as a generic in traits yet. This is the same thing that
     /// [async_trait] generates, but for streams instead of futures.
     ///
-    /// The individual Directory messages *must* be valid.
+    /// The individually returned Directory messages *must* be valid.
+    /// Directories are sent in an order from the root to the leaves, so that
+    /// the receiving side can validate each message to be a connected to the root
+    /// that has initially been requested.
     fn get_recursive(
         &self,
         root_directory_digest: &B3Digest,