diff --git a/packages/core/src/batch/AbstractBatchRenderer.js b/packages/core/src/batch/AbstractBatchRenderer.js
index 6cea4b8..25fc8c4 100644
--- a/packages/core/src/batch/AbstractBatchRenderer.js
+++ b/packages/core/src/batch/AbstractBatchRenderer.js
@@ -746,7 +746,7 @@
      * definitions. It also accounts for built-in attributes.
      *
      * @param {Array<Object>} attributeDefinitions - attribute definitions
-     * @return sum of all attribute sizes
+     * @return {number} sum of all attribute sizes
      * @static
      */
     static vertexSizeOf(attributeDefinitions)

diff --git a/packages/core/src/batch/AbstractBatchRenderer.js b/packages/core/src/batch/AbstractBatchRenderer.js
index 6cea4b8..25fc8c4 100644
--- a/packages/core/src/batch/AbstractBatchRenderer.js
+++ b/packages/core/src/batch/AbstractBatchRenderer.js
@@ -746,7 +746,7 @@
      * definitions. It also accounts for built-in attributes.
      *
      * @param {Array<Object>} attributeDefinitions - attribute definitions
-     * @return sum of all attribute sizes
+     * @return {number} sum of all attribute sizes
      * @static
      */
     static vertexSizeOf(attributeDefinitions)
diff --git a/packages/utils/src/data/sizeOfType.js b/packages/utils/src/data/sizeOfType.js
index cbc8e0f..f647b1f 100644
--- a/packages/utils/src/data/sizeOfType.js
+++ b/packages/utils/src/data/sizeOfType.js
@@ -3,8 +3,9 @@
 /**
  * Returns the size of any type in the `TYPES` enum.
  *
+ * @function sizeOfType
  * @param {number} glint - TYPES enum constant
- * @return size of `glint` in bytes
+ * @return {number} size of `glint` in bytes
  */
 export function sizeOfType(glint)
 {