diff --git a/README.md b/README.md
index 524508d..19602f5 100644
--- a/README.md
+++ b/README.md
@@ -102,7 +102,7 @@ lume.clear(t) -- `t` becomes {}
 Copies all the fields from the source tables to the table `t` and returns `t`.
 Tables are iterated in order, so the right-most table overrides existing
 fields.
-```
+```lua
 local t = { a = 1, b = 2 }
 lume.extend(t, { b = 4, c = 6 }) -- `t` becomes { a = 1, b = 4, c = 6 }
 ```