diff --git a/AtlasGeometryCommon/SubDetectorEnvelopes/SubDetectorEnvelopes/ATLAS_CHECK_THREAD_SAFETY b/AtlasGeometryCommon/SubDetectorEnvelopes/SubDetectorEnvelopes/ATLAS_CHECK_THREAD_SAFETY
new file mode 100644
index 0000000000000000000000000000000000000000..899bd7e08582e4aed2e761f20c7470c507d7d3d0
--- /dev/null
+++ b/AtlasGeometryCommon/SubDetectorEnvelopes/SubDetectorEnvelopes/ATLAS_CHECK_THREAD_SAFETY
@@ -0,0 +1 @@
+AtlasGeometryCommon/SubDetectorEnvelopes