diff --git a/src/index.ts b/src/index.ts
index ab127c0..de7745f 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,4 +1,14 @@
 /**
- * The signature for a function acting as an event handler.
+ * A class.
  */
-export type EventHandler = ((e: Event) => void);
+class MyClass {
+  /**
+   * My summary documentation, which is duplicated.
+   * @param digits - must be a non-negative integer
+   * @returns a function that converts a string to a string without so many decimals
+   * @see See string is also duplicated.
+   */
+  public static stringifyFixed(digits: number): (val: string) => string {
+    return (val: string) => parseFloat(val).toFixed(digits).toString();
+  }
+}