diff --git a/core/scripts/api-spec-generator.js b/core/scripts/api-spec-generator.js
index e6343e776a..2896a5504b 100644
--- a/core/scripts/api-spec-generator.js
+++ b/core/scripts/api-spec-generator.js
@@ -35,6 +35,9 @@ function generateComponent(component, content) {
   component.styles.forEach(prop => {
     content.push(`${component.tag},css-prop,${prop.name}`);
   });
+  component.parts.forEach(part => {
+    content.push(`${component.tag},part,${part.name}`);
+  });
 }
 
 exports.apiSpecGenerator = apiSpecGenerator;