diff --git a/docs/public/presets/toml/plain-text-symbols.toml b/docs/public/presets/toml/plain-text-symbols.toml
index e14c7537..48e9e6eb 100644
--- a/docs/public/presets/toml/plain-text-symbols.toml
+++ b/docs/public/presets/toml/plain-text-symbols.toml
@@ -206,6 +206,9 @@ symbol = "quarto "
 [raku]
 symbol = "raku "
 
+[rlang]
+symbol = "r "
+
 [ruby]
 symbol = "rb "