1 files changed, 4 insertions, 1 deletions
diff --git a/src/buildstream/_protos/buildstream/v2/artifact.proto b/src/buildstream/_protos/buildstream/v2/artifact.proto
index ead792e15..87f66cc95 100644
--- a/src/buildstream/_protos/buildstream/v2/artifact.proto
+++ b/src/buildstream/_protos/buildstream/v2/artifact.proto
@@ -75,6 +75,9 @@ message Artifact {
 
   // digest of a directory
   build.bazel.remote.execution.v2.Digest buildtree = 12;  // optional
+
+  // digest of a directory
+  build.bazel.remote.execution.v2.Digest sources = 13;  // optional
 }
 
 message GetArtifactRequest {
@@ -86,4 +89,4 @@ message UpdateArtifactRequest {
   string instance_name = 1;
   string cache_key = 2;
   Artifact artifact = 3;
-}
-\ No newline at end of file
+}