diff --git a/src/extension-support/argument-type.js b/src/extension-support/argument-type.js
index 0589e9fb6..538a04f5d 100644
--- a/src/extension-support/argument-type.js
+++ b/src/extension-support/argument-type.js
@@ -1,8 +1,31 @@
+/**
+ * Block argument types
+ * @enum {string}
+ */
 const ArgumentType = {
+    /**
+     * Numeric value with angle picker
+     */
     ANGLE: 'angle',
+
+    /**
+     * Boolean value with hexagonal placeholder
+     */
     BOOLEAN: 'Boolean',
+
+    /**
+     * Numeric value with color picker
+     */
     COLOR: 'color',
+
+    /**
+     * Numeric value with text field
+     */
     NUMBER: 'number',
+
+    /**
+     * String value with text field
+     */
     STRING: 'string'
 };
 
diff --git a/src/extension-support/block-type.js b/src/extension-support/block-type.js
index 587f7d598..9a87b745f 100644
--- a/src/extension-support/block-type.js
+++ b/src/extension-support/block-type.js
@@ -1,8 +1,31 @@
+/**
+ * Types of block
+ * @enum {string}
+ */
 const BlockType = {
+    /**
+     * Boolean reporter with hexagonal shape
+     */
     BOOLEAN: 'Boolean',
+
+    /**
+     * Command block
+     */
     COMMAND: 'command',
+
+    /**
+     * Specialized command block which may or may not run a child branch
+     */
     CONDITIONAL: 'conditional',
+
+    /**
+     * Hat block which conditionally starts a block stack
+     */
     HAT: 'hat',
+
+    /**
+     * General reporter with numeric or string value
+     */
     REPORTER: 'reporter'
 };