diff --git a/src/core.js b/src/core.js
index e6d15c8..f97923b 100644
--- a/src/core.js
+++ b/src/core.js
@@ -26,6 +26,7 @@ function calculateScore({ result, guards }) {
 	}
 }
 
+/** @param {ReturnType<import('@projectwallace/css-analyzer').analyze>} analysis */
 export function calculate(analysis) {
 	const performance = calculateScore({ result: analysis, guards: performanceGuards })
 	const maintainability = calculateScore({ result: analysis, guards: maintainabilityGuards })
diff --git a/src/index.js b/src/index.js
index c38a373..2bd40e6 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,6 +1,7 @@
 import { analyze } from '@projectwallace/css-analyzer'
 import { calculate as calculateFromAnalysis } from './core.js'
 
+/** @param {string} css */
 export function calculate(css) {
 	const analysis = analyze(css)
 	return calculateFromAnalysis(analysis)