diff --git a/paddle/gserver/tests/test_LayerGrad.cpp b/paddle/gserver/tests/test_LayerGrad.cpp
index f4bbbf8a8b50a5de12424719760d5cea502082a9..aab02f16849582db4b41087046b810463a855e1a 100644
--- a/paddle/gserver/tests/test_LayerGrad.cpp
+++ b/paddle/gserver/tests/test_LayerGrad.cpp
@@ -2437,6 +2437,7 @@ TEST(Layer, test3DDeConvLayer) {
 
 TEST(Layer, ScaleShiftLayer) {
   // FIXME: Disable ScaleShiftLayer because it is not stable.
+  // https://github.com/PaddlePaddle/Paddle/issues/7781
   return;
   //  const size_t batchSize = 16;
   //  const size_t size = 32;