diff --git a/multi-set.d.ts b/multi-set.d.ts
index 0e40bc40..c348f76f 100644
--- a/multi-set.d.ts
+++ b/multi-set.d.ts
@@ -4,14 +4,52 @@
  */
 export default class MultiSet<K> implements Iterable<K> {
 
-  // Members
+  /**
+   * Number of distinct items in the set.
+   */
   dimension: number;
+  /**
+   * Total number of items in the set.
+   */
   size: number;
 
   // Methods
+  /**
+   * Method used to clear the structure.
+   *
+   * @return {undefined}
+   */
   clear(): void;
+  /**
+   * Adds the item to the set. Optionally, you can provide a number which is the number of times the same item is added.
+   *
+   * Adding an item 0 times is a no-op.
+   *
+   * Adding an item a negative number of times will remove items.
+   *
+   * @param {K} key item to add.
+   * @param {number} count optional count.
+   * @return {MultiSet}
+   */
   add(key: K, count?: number): this;
+  /**
+   * Sets the multiplicity of an item in the set.
+   *
+   * Setting the multiplicity of an item to be 0 or a negative number will remove said item from the set.
+   *
+   * @param {K} key item to set
+   * @param {number} count - desired multiplicity.
+   * @return {MultiSet}
+   */
   set(key: K, count: number): this;
+  /**
+   * Returns true when items are in the set.
+   *
+   * Equivalent to `set.count(item) > 0`.
+   *
+   * @param  {any} key  - Item to check.
+   * @return {boolan}
+   */
   has(key: K): boolean;
   delete(key: K): boolean;
   remove(key: K, count?: number): void;