diff --git a/docs/usage.md b/docs/usage.md
index 827a544..9abc258 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -122,6 +122,7 @@ OpenAI Chat: gpt-3.5-turbo (aliases: 3.5, chatgpt)
     A string where the API will stop generating further tokens.
   logit_bias: dict, str
     Modify the likelihood of specified tokens appearing in the completion.
+    Pass a JSON string like '{"1712":-100, "892":-100, "1489":-100}'
 OpenAI Chat: gpt-3.5-turbo-16k (aliases: chatgpt-16k, 3.5-16k)
   temperature: float
   max_tokens: int
diff --git a/llm/default_plugins/openai_models.py b/llm/default_plugins/openai_models.py
index 38a7c54..72c62b0 100644
--- a/llm/default_plugins/openai_models.py
+++ b/llm/default_plugins/openai_models.py
@@ -110,7 +110,8 @@ class Chat(Model):
         )
         logit_bias: Optional[Union[dict, str]] = Field(
             description=(
-                "Modify the likelihood of specified tokens appearing in the completion."
+                "Modify the likelihood of specified tokens appearing in the completion. "
+                'Pass a JSON string like \'{"1712":-100, "892":-100, "1489":-100}\''
             ),
             default=None,
         )