diff --git a/automatic_canister_filler.ic10 b/automatic_canister_filler.ic10
index c0c3ce9..c57d3e7 100644
--- a/automatic_canister_filler.ic10
+++ b/automatic_canister_filler.ic10
@@ -1,4 +1,15 @@
+# check for presence of canister
 # check canister type in tank storage
 # set target pressure accordingly
 # run volume pump until target pressure in canister is reached
-# stop volume pump
\ No newline at end of file
+# stop volume pump
+
+alias canister_storage d0
+alias volume_pump d1
+
+alias canister_present r0
+alias canister_hash r1
+alias canister_pressure r2
+
+define canister 42280099
+define smart_canister -668314371
\ No newline at end of file