diff --git a/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/utils.js b/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/utils.js
index 5cb7e1de55..f27f1d8f52 100644
--- a/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/utils.js
+++ b/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/utils.js
@@ -20,6 +20,10 @@ export function memoize_expression(state, value) {
 	return b.call('$.get', id);
 }
 
+/**
+ * A utility for extracting complex expressions (such as call expressions)
+ * from templates and replacing them with `$0`, `$1` etc
+ */
 export class Memoizer {
 	/** @type {Array<{ id: Identifier, expression: Expression }>} */
 	#sync = [];