diff --git a/doc/environment.adoc b/doc/environment.adoc
index 675530d..7828045 100644
--- a/doc/environment.adoc
+++ b/doc/environment.adoc
@@ -37,7 +37,7 @@ Finds the length of the hypotenuse `z` according to the Pythagorean Theorem: ste
 
 As Python has built-in big integer support (and uses 64-bit `float`), it can be used to easily determine for which `x` this implementation becomes imprecise due to float precision limitations:
 
-[source,python3]
+[source, python]
 ----
 def factorial(x):
 	return x if x == 1 else x * factorial(x-1)
diff --git a/include/config.adoc b/include/config.adoc
index 692f1dd..ed7929b 100644
--- a/include/config.adoc
+++ b/include/config.adoc
@@ -1,6 +1,8 @@
 Minetest-Docs and contributors
 :experimental: true
 :stem:
+:source-highlighter: highlightjs
+
 :toc:
 :toclevels: 5