diff --git a/common/arg.cpp b/common/arg.cpp
index cd4f0aa486..ab256196da 100644
--- a/common/arg.cpp
+++ b/common/arg.cpp
@@ -3759,9 +3759,9 @@ common_params_context common_params_parser_init(common_params & params, llama_ex
     ).set_examples({LLAMA_EXAMPLE_SERVER}));
     add_opt(common_arg(
         {"--sleep-mode"}, "MODE",
-        "what to release when the server sleeps:\n"
+        "sleep behavior:\n"
         "- 'free' frees context and model memory\n"
-        "- 'rst' restarts the whole process, may help reset memory to zero on certain backend\n"
+        "- 'rst' restarts the whole process, may help reset memory to zero on certain backend (only support posix env)\n"
         "(default: free)",
         [](common_params & params, const std::string & value) {
             if (value == "free") {
diff --git a/tools/server/README.md b/tools/server/README.md
index 3296a59847..8a56029851 100644
--- a/tools/server/README.md
+++ b/tools/server/README.md
@@ -237,7 +237,7 @@ For the full list of features, please refer to [server's changelog](https://gith
 | `-sps, --slot-prompt-similarity SIMILARITY` | how much the prompt of a request must match the prompt of a slot in order to use that slot (default: 0.10, 0.0 = disabled) |
 | `--lora-init-without-apply` | load LoRA adapters without applying them (apply later via POST /lora-adapters) (default: disabled) |
 | `--sleep-idle-seconds SECONDS` | number of seconds of idleness after which the server will sleep (default: -1; -1 = disabled) |
-| `--sleep-mode MODE` | what to release when the server sleeps:<br/>- 'free' frees context and model memory<br/>- 'rst' restarts the whole process, may help reset memory to zero on certain backend<br/>(default: free) |
+| `--sleep-mode MODE` | sleep behavior:<br/>- 'free' frees context and model memory<br/>- 'rst' restarts the whole process, may help reset memory to zero on certain backend (only support posix env)<br/>(default: free) |
 | `--log-prompts-dir PATH` | Log prompts to directory (auto-created if not present; only used for debugging, default: disabled) |
 | `--spec-draft-hf, -hfd, -hfrd, --hf-repo-draft <user>/<model>[:quant]` | Same as --hf-repo, but for the draft model (default: unused)<br/>(env: LLAMA_ARG_SPEC_DRAFT_HF_REPO) |
 | `--spec-draft-threads, -td, --threads-draft N` | number of threads to use during generation (default: same as --threads) |