diff --git a/docs/src/man/categorical.md b/docs/src/man/categorical.md
index 827f8810b2..ce68555aee 100644
--- a/docs/src/man/categorical.md
+++ b/docs/src/man/categorical.md
@@ -80,7 +80,7 @@ julia> sort(cv)
 
 ```
 
-By default, a `CategoricalArray` is able to represent ``2^32`` different levels.
+By default, a `CategoricalArray` is able to represent ``2^{32}`` different levels.
 You can use less memory by calling the `compress` function:
 
 ```jldoctest categorical