diff --git a/dot_config/fish/conf.d/20-aliases.fish b/dot_config/fish/conf.d/20-aliases.fish
index 469219e..2f4b58d 100644
--- a/dot_config/fish/conf.d/20-aliases.fish
+++ b/dot_config/fish/conf.d/20-aliases.fish
@@ -79,4 +79,7 @@ end
 
 # Check battery.
 
-upower -i /org/freedesktop/UPower/devices/battery_BAT0 | grep -E "state|time to|percentage"
+function batt -d "Check battery percentage"
+    upower -i /org/freedesktop/UPower/devices/battery_BAT0 \
+        | grep -E "state|time to|percentage"
+end