diff --git a/src/libexpr/primops/fetchTree.cc b/src/libexpr/primops/fetchTree.cc
index a99b0e500..767f559be 100644
--- a/src/libexpr/primops/fetchTree.cc
+++ b/src/libexpr/primops/fetchTree.cc
@@ -392,7 +392,7 @@ static RegisterPrimOp primop_fetchGit({
 
         The URL of the repo.
 
-      - `name` (default: *basename of the URL*)
+      - `name` (default: `source`)
 
         The name of the directory the repo should be exported to in the store.