diff --git a/app/blocks/variables/get.js b/app/blocks/variables/get.js
index 177b81d..ffcafb8 100644
--- a/app/blocks/variables/get.js
+++ b/app/blocks/variables/get.js
@@ -1,3 +1,4 @@
+/** @type {import('#types').BlockDefinitionRaw} */
 export default {
   type: 'io_variables_get',
   bytecodeKey: "getVariable",
diff --git a/app/blocks/variables/set.js b/app/blocks/variables/set.js
index 6d5a840..18b354b 100644
--- a/app/blocks/variables/set.js
+++ b/app/blocks/variables/set.js
@@ -1,3 +1,4 @@
+/** @type {import('#types').BlockDefinitionRaw} */
 export default {
   type: 'io_variables_set',
   bytecodeKey: "setVariable",
@@ -36,6 +37,7 @@ export default {
       const
         defaultedValue = value
           ? JSON.parse(value)
+          // TODO: is this !== 0 check superfluous?
           : (value !== 0 && value !== null) && null,
         blockPayload = JSON.stringify({
           setVariable: {
diff --git a/app/types.js b/app/types.js
index 836a0f0..cb6ad40 100644
--- a/app/types.js
+++ b/app/types.js
@@ -48,6 +48,7 @@
  * @typedef {object} BlockRegeneratorHelpers
  * @property {function} expressionToBlock
  * @property {function} arrayToStatements
+ * @property {function} registerVariable
  */
 
 /**