diff --git a/docs/docs/usage-guide/changing_a_model.md b/docs/docs/usage-guide/changing_a_model.md
index f5d9b333..e6926a99 100644
--- a/docs/docs/usage-guide/changing_a_model.md
+++ b/docs/docs/usage-guide/changing_a_model.md
@@ -379,7 +379,7 @@ To bypass chat templates and temperature controls, set `config.custom_reasoning_
 
 ```toml
 [config]
-reasoning_efffort = "medium" # "low", "medium", "high"
+reasoning_effort = "medium" # "low", "medium", "high"
 ```
 
 With the OpenAI models that support reasoning effort (eg: o4-mini), you can specify its reasoning effort via `config` section. The default value is `medium`. You can change it to `high` or `low` based on your usage.