diff --git a/docs/src/styleguide.md b/docs/src/styleguide.md
index c2562a0c651..60e227204ca 100644
--- a/docs/src/styleguide.md
+++ b/docs/src/styleguide.md
@@ -53,9 +53,9 @@ of your PR), you need to install JuliaFormatter.jl first by running
 ```shell
 julia -e 'using Pkg; Pkg.add("JuliaFormatter")'
 ```
-You can then recursively format all Julia files in the Trixi.jl repo by executing
+You can then recursively format the core Julia files in the Trixi.jl repo by executing
 ```shell
-julia -e 'using JuliaFormatter; format(".")'
+julia -e 'using JuliaFormatter; format(["benchmark", "ext", "src", "utils"])'
 ```
 from inside the Trixi.jl repository. For convenience, there is also a script you can
 directly run from your terminal shell, which will automatically install JuliaFormatter in a