diff --git a/config.toml b/config.toml
index fa73b91b..dc3f1478 100644
--- a/config.toml
+++ b/config.toml
@@ -109,6 +109,10 @@ notoc = true
 # First one is picked as the Twitter card image if not set on page.
 images = ["images/og-image-fission.png"]
 
+[params.mermaid]
+enable = true
+theme = "neutral"
+
 [params.social]
 #github = ''
 #slackurl = ""
@@ -216,4 +220,4 @@ weight = 13
 name = "Discord"
 pre = "<i class='fab fa-discord'></i>"
 url = "https://discord.gg/4wbfNv3"
-weight = 14
\ No newline at end of file
+weight = 14