diff --git a/paddle/operators/CMakeLists.txt b/paddle/operators/CMakeLists.txt
index d0924aaf37f0b45f43f510850d85bc2894b07516..75fcc1cda165197fc4413efc6bbbc440088cb4cd 100644
--- a/paddle/operators/CMakeLists.txt
+++ b/paddle/operators/CMakeLists.txt
@@ -84,7 +84,7 @@ function(op_library TARGET)
     endif()
 
     # pybind USE_NO_KERNEL_OP
-    # operators may reuse code from
+    # HACK: if REGISTER_OP_CPU_KERNEL presents the operator must have kernel
     file(READ ${TARGET}.cc TARGET_CONTENT)
     string(REGEX MATCH "REGISTER_OP_CPU_KERNEL" regex_result "${TARGET_CONTENT}")
     string(REPLACE "_op" "" TARGET "${TARGET}")