diff --git a/docs/Arguments.md b/docs/Arguments.md
index ff237a6..36f669d 100644
--- a/docs/Arguments.md
+++ b/docs/Arguments.md
@@ -42,7 +42,7 @@ usage: -m llumnix.entrypoints.vllm.api_server [-h]
             [--last-stage-max-blocks LAST_STAGE_MAX_BLOCKS]
             [--max-stages MAX_STAGES]
             [--enable-pd-disagg]
-            [--engine-type ENGINE_TYPE]
+            [--instance-type ENGINE_TYPE]
             [--log-request-timestamps]
 
 ```
@@ -189,7 +189,7 @@ usage: -m llumnix.entrypoints.vllm.api_server [-h]
 `--enable-pd-disagg`
 - Enable prefill decoding disaggregation.
 
-`--engine-type`
+`--instance-type`
 - Engine types for llumlet.
 - Possible choices: prefill, decode, no_constraints