diff --git a/python/sglang/srt/server_args.py b/python/sglang/srt/server_args.py
index db35346a1..1b62823e3 100644
--- a/python/sglang/srt/server_args.py
+++ b/python/sglang/srt/server_args.py
@@ -201,7 +201,7 @@ FP4_GEMM_RUNNER_BACKEND_CHOICES = [
     "flashinfer_trtllm",
 ]
 
-RADIX_EVICTION_POLICY_CHOICES = ["lru", "lfu", "slru"]
+RADIX_EVICTION_POLICY_CHOICES = ["lru", "lfu", "slru", "priority"]
 
 RL_ON_POLICY_TARGET_CHOICES = ["fsdp"]
 
@@ -4391,7 +4391,7 @@ class ServerArgs:
             type=str,
             choices=RADIX_EVICTION_POLICY_CHOICES,
             default=ServerArgs.radix_eviction_policy,
-            help="The eviction policy of radix trees. 'lru' stands for Least Recently Used, 'lfu' stands for Least Frequently Used, and 'slru' stands for Segmented Least Recently Used.",
+            help="The eviction policy of radix trees. 'lru' stands for Least Recently Used, 'lfu' stands for Least Frequently Used, 'slru' stands for Segmented Least Recently Used, and 'priority' evicts lower-priority requests first.",
         )
         parser.add_argument(
             "--enable-prefill-delayer",