diff --git a/README.md b/README.md
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@@ -1,3 +1,5 @@
+# Please check the FSUDAQ_Qt6. This code is no longer developing.
+
 # Recent development
 
 Tested the ClassDigitizer.h/C for very high rate data recording for single and multiple digitizers, each digitizer has 5 inputs from a pulser. In the condition without trace and Extra2, Max Events per aggregation = 1032 and Max aggregations per BLT = 80. it can run at 100k without problem.