diff --git a/website/docs/Use-Cases/Tune-User-Defined-Function.md b/website/docs/Use-Cases/Tune-User-Defined-Function.md
index 65b72357b..af8e18188 100644
--- a/website/docs/Use-Cases/Tune-User-Defined-Function.md
+++ b/website/docs/Use-Cases/Tune-User-Defined-Function.md
@@ -232,7 +232,7 @@ flaml.tune.run(evaluation_function=evaluate_config, mode="min",
                metric_constraints=[("score", "<=", 0.4)],...)
 ```
 
-### Paralle tuning
+### Parallel tuning
 
 Related arguments:
 
@@ -546,4 +546,4 @@ For more technical details, please check our papers.
     year={2021},
     booktitle={ICLR'21},
 }
-```
\ No newline at end of file
+```