diff --git a/src/collection.js b/src/collection.js
index 14d2a42..be6d6e7 100644
--- a/src/collection.js
+++ b/src/collection.js
@@ -39,8 +39,8 @@ class Collection extends EventEmitter(Object) {
    * Create a new **Collection**, perhaps to contain a specific type of `model`.
    * If a `comparator` is specified, the Collection will maintain
    * its models in sort order, as they're added and removed.
-   * @param {Model[]} models
-   * @param {CollectionOptions} options
+   * @param {Model[]} [models]
+   * @param {CollectionOptions} [options]
    */
   constructor(models, options) {
     super();
diff --git a/src/model.js b/src/model.js
index 1f8d594..81d9388 100644
--- a/src/model.js
+++ b/src/model.js
@@ -38,7 +38,7 @@ class Model extends EventEmitter(Object) {
    * Create a new model with the specified attributes. A client id (`cid`)
    * is automatically generated and assigned for you.
    * @param {Attributes} attributes
-   * @param {ModelOptions} options
+   * @param {ModelOptions} [options]
    */
   constructor(attributes, options) {
     super();
diff --git a/src/types/collection.d.ts b/src/types/collection.d.ts
index f6112ab..c5373c1 100644
--- a/src/types/collection.d.ts
+++ b/src/types/collection.d.ts
@@ -9,8 +9,8 @@ declare const Collection_base: {
          * Create a new **Collection**, perhaps to contain a specific type of `model`.
          * If a `comparator` is specified, the Collection will maintain
          * its models in sort order, as they're added and removed.
-         * @param {Model[]} models
-         * @param {CollectionOptions} options
+         * @param {Model[]} [models]
+         * @param {CollectionOptions} [options]
          */
         _listeners: {};
         listenTo(obj: any, name: string, callback?: (event: any, model: Model, collection: Collection, options: Record<string, any>) => any): any;
@@ -46,10 +46,10 @@ export class Collection extends Collection_base {
      * Create a new **Collection**, perhaps to contain a specific type of `model`.
      * If a `comparator` is specified, the Collection will maintain
      * its models in sort order, as they're added and removed.
-     * @param {Model[]} models
-     * @param {CollectionOptions} options
+     * @param {Model[]} [models]
+     * @param {CollectionOptions} [options]
      */
-    constructor(models: Model[], options: CollectionOptions, ...args: any[]);
+    constructor(models?: Model[], options?: CollectionOptions, ...args: any[]);
     _model: any;
     comparator: any;
     /**
diff --git a/src/types/collection.d.ts.map b/src/types/collection.d.ts.map
index 4d98d12..0c12798 100644
--- a/src/types/collection.d.ts.map
+++ b/src/types/collection.d.ts.map
@@ -1 +1 @@
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\ No newline at end of file
+{"version":3,"file":"collection.d.ts","sourceRoot":"","sources":["../collection.js"],"names":[],"mappings":"sBAkBa,OAAQ,MAAM,EAAE,GAAG,CAAC;yBACpB,OAAQ,MAAM,EAAE,GAAG,CAAC;sBAEpB,OAAO,cAAc,EAAE,OAAO;gCAE9B,OAAQ,MAAM,EAAE,GAAG,CAAC;;;;sBAc/B;;;;;;WAMG;;;;;;;;;;;;AA1BL;;;;;;;;;GASG;AAEH;;;;;;;GAOG;AACH;IACE;;;;;;OAMG;IACH,qBAHW,KAAK,EAAE,YACP,iBAAiB,kBAa3B;IAPoB,YAA2B;IACR,gBAAoC;IAQ5E;;OAEG;IACH,wDAEC;IAED;;OAEG;IACH,qDAEC;IARC,gDAA8B;IAmBhC;;OAEG;IACH,6BAEC;IAdD;;;;OAIG;IACH,0BAEC;IASD,kBAEC;IAED;;;OAGG;IACH,sBAAkB;IAElB;;;OAGG;IACH,mBAAe;IAEf;;;;OAIG;IACH,gBAFU,OAAO,OAMhB;IAED;;;;OAIG;IACH,aAJU,MAAM,SACN,KAAK,GAAC,UAAU,WAChB,OAAO,OAIhB;IAED;;;;;;OAMG;IACH,YAHU,KAAK,EAAE,GAAC,KAAK,GAAC,UAAU,GAAC,UAAU,EAAE,WACrC,OAAO,OAIhB;IAED;;;;OAIG;IACH,eAHW,KAAK,GAAC,KAAK,EAAE,WACb,OAAO,OAYjB;IAED;;;;;;;OAOG;IACH,YAHU,KAAK,EAAE,GAAC,KAAK,GAAC,UAAU,GAAC,UAAU,EAAE,WACpC,OAAO,OAkHjB;IAED,kEAkBC;IAED;;;;;;;OAOG;IACH,eAHW,KAAK,GAAC,KAAK,EAAE,YACb,OAAO,mBAYjB;IAED;;;;OAIG;IACH,YAHW,KAAK,YACL,OAAO,OAIjB;IAED;;;OAGG;IACH,cAFW,OAAO,OAKjB;IAED;;;;OAIG;IACH,eAHW,KAAK,YACL,OAAO,OAIjB;IAED;;;OAGG;IACH,gBAFW,OAAO,OAKjB;IAED,2DAA2D;IAC3D,2BAEC;IAED;;;OAGG;IACH,iBAHW,cAAe,WACf,GAAG,OAIb;IAED;;OAEG;IACH,2BAMC;IAED;;OAEG;IACH,mBAFW,KAAK,EAAE,OAIjB;IAED,WAEC;IAED,WAEC;IAED,sBAEC;IAED;;OAEG;IACH,WAFW,cAAe,OAQzB;IAED,2BAKC;IAED,mBAEC;IAED,0BAEC;IAED,uCAEC;IAED,0CAEC;IAED,yBAEC;IAED,YAEC;IAED,qBAEC;IAED,wBAEC;IAED;;OAEG;IACH,mBAFW,MAAM,OAIhB;IAED;;;OAGG;IACH,oBAHW,WAAS,MAAM,GAAC,MAAM,aACtB,MAAM,OAOhB;IAED;;OAEG;IACH,uBAFW,MAAM,OAIhB;IAED;;OAEG;IACH,gBAFW,WAAS,MAAM,GAAC,MAAM,OAIhC;IAED,YAGC;IAED,YAEC;IAED,aAEC;IAED,gCAEC;IAED,8CAEC;IAED,mDAEC;IAED,iBAEC;IAED;;;;OAIG;IACH,SAFW,MAAM,GAAC,MAAM,SAAQ,KAAK,OASpC;IAED;;;OAGG;IACH,SAFW,MAAM,GAAC,MAAM,SAAQ,KAAK,WAIpC;IAED;;;OAGG;IACH,UAFW,MAAM,OAKhB;IAED;;;;;OAKG;IACH,aAHW,UAAU,SACV,OAAO,OAIjB;IAED;;;;OAIG;IACH,iBAFW,UAAU,OAIpB;IAED;;;OAGG;IACH,gBAHW,UAAU,cACV,MAAM,OAKhB;IAED;;;;;OAKG;IACH,cAFW,OAAO,QAkBjB;IANG,YAAqC;IAQzC;;;OAGG;IACH,YAFW,MAAM,OAIhB;IAED;;;;;OAKG;IACH,eAFW,OAAO,OAiBjB;IAED;;;;;;OAMG;IACH,cAHW,KAAK,GAAC,UAAU,YAChB,OAAO;;;;;;oBAqCjB;IAED;;;;;OAKG;IACH,2BAFW,OAAO,OAIjB;IAED;;;OAGG;IACH,eAFW,UAAU,OAIpB;IAED,wDAAwD;IACxD,6BAEC;IAED,2DAA2D;IAC3D,2BAEC;IAED,oEAAoE;IACpE,8BAEC;IAED;;;OAGG;IACH,eAGC;IADC,UAAe;IAGjB;;;OAGG;IACH,mBAHW,UAAU,YACV,OAAO,SAKjB;IAED;;;;;;OAMG;IACH,qBAJW,UAAU,GAAC,KAAK,YAChB,OAAO,GACN,KAAK,CAahB;IAED;;;;OAIG;IACH,sBAHW,KAAK,EAAE,YACP,OAAO,SA0BjB;IAED;;;;OAIG;IACH,gBAFW,GAAG,WAIb;IAED;;;;OAIG;IACH,qBAHW,KAAK,YACL,OAAO,QAOjB;IAED;;;;;OAKG;IACH,yBAMC;IAED;;;;;;;;;;OAUG;IACH,sBAcC;IAjwBC,4CAAmC;CAkwBtC;sBAvzBqB,YAAY;AAg0BlC;IACE;;;;;;;OAOG;IACH,wBAHW,UAAU,gBAOpB;IAHC,wBAA6B;IAC7B,cAAiB;IACjB,eAAe;IAGjB;;;MA6BC;IAED,0BAEC;CACF"}
\ No newline at end of file
diff --git a/src/types/model.d.ts b/src/types/model.d.ts
index 1d43047..0bdd18d 100644
--- a/src/types/model.d.ts
+++ b/src/types/model.d.ts
@@ -60,9 +60,9 @@ export class Model extends Model_base {
      * Create a new model with the specified attributes. A client id (`cid`)
      * is automatically generated and assigned for you.
      * @param {Attributes} attributes
-     * @param {ModelOptions} options
+     * @param {ModelOptions} [options]
      */
-    constructor(attributes: Attributes, options: ModelOptions, ...args: any[]);
+    constructor(attributes: Attributes, options?: ModelOptions, ...args: any[]);
     cid: any;
     attributes: {};
     validationError: any;
diff --git a/src/types/model.d.ts.map b/src/types/model.d.ts.map
index 456bcd0..f0c21df 100644
--- a/src/types/model.d.ts.map
+++ b/src/types/model.d.ts.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file