diff --git a/src/libstore/include/nix/store/worker-protocol.hh b/src/libstore/include/nix/store/worker-protocol.hh
index 29d4828c2..aec3820d2 100644
--- a/src/libstore/include/nix/store/worker-protocol.hh
+++ b/src/libstore/include/nix/store/worker-protocol.hh
@@ -152,6 +152,7 @@ enum struct WorkerProto::Op : uint64_t {
     AddIndirectRoot = 12,
     SyncWithGC = 13,
     FindRoots = 14,
+    // ExportPath = 16, // removed
     QueryDeriver = 18, // obsolete
     SetOptions = 19,
     CollectGarbage = 20,
@@ -161,6 +162,7 @@ enum struct WorkerProto::Op : uint64_t {
     QueryFailedPaths = 24,
     ClearFailedPaths = 25,
     QueryPathInfo = 26,
+    // ImportPaths = 27, // removed
     QueryDerivationOutputNames = 28, // obsolete
     QueryPathFromHashPart = 29,
     QuerySubstitutablePathInfos = 30,