diff --git a/doc/Serving_Configure_EN.md b/doc/Serving_Configure_EN.md
index e1042bf2653f24919433b615c396e7db0f2db37f..b725c8aa51df927c3c45cbe324fa04006a1953e2 100644
--- a/doc/Serving_Configure_EN.md
+++ b/doc/Serving_Configure_EN.md
@@ -422,7 +422,7 @@ op:
             #use_mkldnn
             #use_mkldnn: True
 
-            #ir_optim
+            #ir_optim, When running on TensorRT，must set ir_optim=True
             ir_optim: True
 ```