diff --git a/exampleSite/content/posts/render-latex-using-katex.md b/exampleSite/content/posts/render-latex-using-katex.md
index 2cd510b..fd7a926 100644
--- a/exampleSite/content/posts/render-latex-using-katex.md
+++ b/exampleSite/content/posts/render-latex-using-katex.md
@@ -14,6 +14,8 @@ katex = "true"
+++
```
+If you want to enable KaTeX or MathJax for all post, add `katex = ture` or `math = true` in `config.toml` in `[params]` section.
+
It's almost a dropin alternative to the mathjax solution,you should just choose one of them.
Inline math looks like this
diff --git a/layouts/partials/posts/math.html b/layouts/partials/posts/math.html
index 49c07ce..93e5ce4 100644
--- a/layouts/partials/posts/math.html
+++ b/layouts/partials/posts/math.html
@@ -1,4 +1,4 @@
-{{- if .Params.math -}}
+{{- if or (.Params.math) (.Site.Params.math) -}}
@@ -17,7 +17,7 @@
};
{{- end -}}
-{{- if .Params.katex -}}
+{{- if or (.Params.katex) (.Site.Params.katex) -}}