diff --git a/app/blocks/math/arithmetic.js b/app/blocks/math/arithmetic.js
index bf3dcff..30cf12c 100644
--- a/app/blocks/math/arithmetic.js
+++ b/app/blocks/math/arithmetic.js
@@ -1,3 +1,4 @@
+/** @type {import('#types').BlockDefinitionRaw} */
 export default {
   type: 'io_math_arithmetic',
   bytecodeKey: "arithmetic",
diff --git a/app/blocks/math/compare.js b/app/blocks/math/compare.js
index acdcc42..4578ce7 100644
--- a/app/blocks/math/compare.js
+++ b/app/blocks/math/compare.js
@@ -1,3 +1,4 @@
+/** @type {import('#types').BlockDefinitionRaw} */
 export default {
   type: 'io_logic_compare',
   bytecodeKey: "",
diff --git a/app/blocks/math/constrain.js b/app/blocks/math/constrain.js
index ae69c1f..ef5bbad 100644
--- a/app/blocks/math/constrain.js
+++ b/app/blocks/math/constrain.js
@@ -1,3 +1,4 @@
+/** @type {import('#types').BlockDefinitionRaw} */
 export default {
   type: "io_math_constrain",
   bytecodeKey: "constrain",
diff --git a/app/blocks/math/map.js b/app/blocks/math/map.js
index 3473524..8a3264c 100644
--- a/app/blocks/math/map.js
+++ b/app/blocks/math/map.js
@@ -1,3 +1,4 @@
+/** @type {import('#types').BlockDefinitionRaw} */
 export default {
   type: "math_map",
   bytecodeKey: "mapValue",
diff --git a/app/blocks/math/round.js b/app/blocks/math/round.js
index 02a04d9..ea9e22f 100644
--- a/app/blocks/math/round.js
+++ b/app/blocks/math/round.js
@@ -1,3 +1,4 @@
+/** @type {import('#types').BlockDefinitionRaw} */
 export default {
   type: "io_math_round",
   bytecodeKey: "round",
diff --git a/app/types.js b/app/types.js
index 09a2679..cae964e 100644
--- a/app/types.js
+++ b/app/types.js
@@ -63,6 +63,9 @@
  * @prop {(number|string)=} color A number or string from 0-360 that specifies a
  *   color in Blockly's radial color space
  * @prop {(number|string)=} colour Alias for "color"
+ * @prop {string=} primaryCategory For blocks appearing in multiple categories,
+ *   this property determines which menu this block will appear under in the
+ *   docs.
  * @prop {string} description Markdown documentation for this block. The first
  *   line will be automatically set as the Block's tooltip.
  * @prop {BlockConnections} connections