diff --git a/.Rbuildignore b/.Rbuildignore
index 7a6244ac..edbedc8f 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -11,3 +11,5 @@
 ^arf.*\.tgz$
 ^doc$
 ^Meta$
+^air\.toml$
+^jarl\.toml$
diff --git a/air.toml b/air.toml
new file mode 100644
index 00000000..b2da3700
--- /dev/null
+++ b/air.toml
@@ -0,0 +1,7 @@
+[format]
+line-width = 120
+indent-width = 2
+indent-style = "space"
+line-ending = "auto"
+persistent-line-breaks = true
+default-exclude = true
diff --git a/jarl.toml b/jarl.toml
new file mode 100644
index 00000000..d05a9029
--- /dev/null
+++ b/jarl.toml
@@ -0,0 +1,12 @@
+# Jarl (Just Another R Linter) configuration — https://jarl.etiennebacher.com
+#
+# Division of labour: air (air.toml) owns formatting/style; jarl owns
+# correctness/quality lints. We start from jarl's default rule set and add
+# `assignment` so `<-` is enforced consistently with air. Quote style is left
+# to air, not duplicated here. Tighten later, e.g. select = ["ALL"] + ignores.
+
+[lint]
+extend-select = ["assignment"]
+
+[lint.assignment]
+operator = "<-"