diff --git a/completions/fish/swayidle.fish b/completions/fish/swayidle.fish
new file mode 100644
index 000000000..71279925f
--- /dev/null
+++ b/completions/fish/swayidle.fish
@@ -0,0 +1,3 @@
+# swayidle
+complete -c swayidle -s h --description 'show help'
+complete -c swayidle -s d --description 'debug'
diff --git a/meson.build b/meson.build
index 1e2b53fa3..4687986b9 100644
--- a/meson.build
+++ b/meson.build
@@ -244,6 +244,7 @@ endif
 if (get_option('fish-completions'))
 	fish_files = files(
 		'completions/fish/sway.fish',
+		'completions/fish/swayidle.fish',
 		'completions/fish/swaylock.fish',
 		'completions/fish/swaymsg.fish',
 	)