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-rw-r--r--Modules/gcmodule.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/Modules/gcmodule.c b/Modules/gcmodule.c
index 5685101bb6..e0c763173c 100644
--- a/Modules/gcmodule.c
+++ b/Modules/gcmodule.c
@@ -963,6 +963,9 @@ _PyObject_GC_Track(PyObject *op)
void
PyObject_GC_UnTrack(void *op)
{
+ /* Obscure: the Py_TRASHCAN mechanism requires that we be able to
+ * call PyObject_GC_UnTrack twice on an object.
+ */
if (IS_TRACKED(op))
_PyObject_GC_UNTRACK(op);
}