diff --git a/lib/model.js b/lib/model.js
index f88c8f4edbb..cd413bbd2d1 100644
--- a/lib/model.js
+++ b/lib/model.js
@@ -2408,6 +2408,7 @@ Model.$where = function $where() {
  * @param {Object} [update]
  * @param {Object} [options] optional see [`Query.prototype.setOptions()`](http://mongoosejs.com/docs/api.html#query_Query-setOptions)
  * @param {Object} [options.lean] if truthy, mongoose will return the document as a plain JavaScript object rather than a mongoose document. See [`Query.lean()`](/docs/api.html#query_Query-lean) and [the Mongoose lean tutorial](/docs/tutorials/lean.html).
+ * @param {ClientSession} [options.session=null] The session associated with this query. See [transactions docs](/docs/transactions.html).
  * @param {Boolean|String} [options.strict] overwrites the schema's [strict mode option](http://mongoosejs.com/docs/guide.html#strict)
  * @param {Boolean} [options.omitUndefined=false] If true, delete any properties whose value is `undefined` when casting an update. In other words, if this is set, Mongoose will delete `baz` from the update in `Model.updateOne({}, { foo: 'bar', baz: undefined })` before sending the update to the server.
  * @param {Function} [callback]
@@ -2634,6 +2635,7 @@ Model.findByIdAndUpdate = function(id, update, options, callback) {
  * @param {Object} conditions
  * @param {Object} [options] optional see [`Query.prototype.setOptions()`](http://mongoosejs.com/docs/api.html#query_Query-setOptions)
  * @param {Boolean|String} [options.strict] overwrites the schema's [strict mode option](http://mongoosejs.com/docs/guide.html#strict)
+ * @param {ClientSession} [options.session=null] The session associated with this query. See [transactions docs](/docs/transactions.html).
  * @param {Function} [callback]
  * @return {Query}
  * @api public
@@ -2739,6 +2741,7 @@ Model.findByIdAndDelete = function(id, options, callback) {
  * @param {Object} [replacement] Replace with this document
  * @param {Object} [options] optional see [`Query.prototype.setOptions()`](http://mongoosejs.com/docs/api.html#query_Query-setOptions)
  * @param {Object} [options.lean] if truthy, mongoose will return the document as a plain JavaScript object rather than a mongoose document. See [`Query.lean()`](http://mongoosejs.com/docs/api.html#query_Query-lean).
+ * @param {ClientSession} [options.session=null] The session associated with this query. See [transactions docs](/docs/transactions.html).
  * @param {Boolean|String} [options.strict] overwrites the schema's [strict mode option](http://mongoosejs.com/docs/guide.html#strict)
  * @param {Boolean} [options.omitUndefined=false] If true, delete any properties whose value is `undefined` when casting an update. In other words, if this is set, Mongoose will delete `baz` from the update in `Model.updateOne({}, { foo: 'bar', baz: undefined })` before sending the update to the server.
  * @param {Function} [callback]
@@ -2829,6 +2832,7 @@ Model.findOneAndReplace = function(filter, replacement, options, callback) {
  *
  * @param {Object} conditions
  * @param {Object} [options] optional see [`Query.prototype.setOptions()`](http://mongoosejs.com/docs/api.html#query_Query-setOptions)
+ * @param {ClientSession} [options.session=null] The session associated with this query. See [transactions docs](/docs/transactions.html).
  * @param {Boolean|String} [options.strict] overwrites the schema's [strict mode option](http://mongoosejs.com/docs/guide.html#strict)
  * @param {Function} [callback]
  * @return {Query}
@@ -2894,6 +2898,7 @@ Model.findOneAndRemove = function(conditions, options, callback) {
  * @param {Object|Number|String} id value of `_id` to query by
  * @param {Object} [options] optional see [`Query.prototype.setOptions()`](http://mongoosejs.com/docs/api.html#query_Query-setOptions)
  * @param {Boolean|String} [options.strict] overwrites the schema's [strict mode option](http://mongoosejs.com/docs/guide.html#strict)
+ * @param {ClientSession} [options.session=null] The session associated with this query. See [transactions docs](/docs/transactions.html).
  * @param {Function} [callback]
  * @return {Query}
  * @see Model.findOneAndRemove #model_Model.findOneAndRemove
diff --git a/lib/query.js b/lib/query.js
index bb501e5c5ae..222d210fe24 100644
--- a/lib/query.js
+++ b/lib/query.js
@@ -2915,6 +2915,7 @@ function prepareDiscriminatorCriteria(query) {
  * @param {Object} [options]
  * @param {Boolean} [options.rawResult] if true, returns the [raw result from the MongoDB driver](http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#findAndModify)
  * @param {Boolean|String} [options.strict] overwrites the schema's [strict mode option](http://mongoosejs.com/docs/guide.html#strict)
+ * @param {ClientSession} [options.session=null] The session associated with this query. See [transactions docs](/docs/transactions.html).
  * @param {Boolean} [options.multipleCastError] by default, mongoose only returns the first error that occurred in casting the query. Turn on this option to aggregate all the cast errors.
  * @param {Object} [options.lean] if truthy, mongoose will return the document as a plain JavaScript object rather than a mongoose document. See [`Query.lean()`](http://mongoosejs.com/docs/api.html#query_Query-lean).
  * @param {Boolean} [options.omitUndefined=false] If true, delete any properties whose value is `undefined` when casting an update. In other words, if this is set, Mongoose will delete `baz` from the update in `Model.updateOne({}, { foo: 'bar', baz: undefined })` before sending the update to the server.
@@ -3039,6 +3040,7 @@ Query.prototype._findOneAndUpdate = wrapThunk(function(callback) {
  * @param {Object} [conditions]
  * @param {Object} [options]
  * @param {Boolean} [options.rawResult] if true, returns the [raw result from the MongoDB driver](http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#findAndModify)
+ * @param {ClientSession} [options.session=null] The session associated with this query. See [transactions docs](/docs/transactions.html).
  * @param {Boolean|String} [options.strict] overwrites the schema's [strict mode option](http://mongoosejs.com/docs/guide.html#strict)
  * @param {Function} [callback] optional params are (error, document)
  * @return {Query} this
@@ -3123,6 +3125,7 @@ Query.prototype.findOneAndRemove = function(conditions, options, callback) {
  * @param {Object} [conditions]
  * @param {Object} [options]
  * @param {Boolean} [options.rawResult] if true, returns the [raw result from the MongoDB driver](http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#findAndModify)
+ * @param {ClientSession} [options.session=null] The session associated with this query. See [transactions docs](/docs/transactions.html).
  * @param {Boolean|String} [options.strict] overwrites the schema's [strict mode option](http://mongoosejs.com/docs/guide.html#strict)
  * @param {Function} [callback] optional params are (error, document)
  * @return {Query} this
@@ -3241,6 +3244,7 @@ Query.prototype._findOneAndDelete = wrapThunk(function(callback) {
  * @param {Object} [replacement]
  * @param {Object} [options]
  * @param {Boolean} [options.rawResult] if true, returns the [raw result from the MongoDB driver](http://mongodb.github.io/node-mongodb-native/2.0/api/Collection.html#findAndModify)
+ * @param {ClientSession} [options.session=null] The session associated with this query. See [transactions docs](/docs/transactions.html).
  * @param {Boolean|String} [options.strict] overwrites the schema's [strict mode option](http://mongoosejs.com/docs/guide.html#strict)
  * @param {Object} [options.lean] if truthy, mongoose will return the document as a plain JavaScript object rather than a mongoose document. See [`Query.lean()`](http://mongoosejs.com/docs/api.html#query_Query-lean).
  * @param {Boolean} [options.omitUndefined=false] If true, delete any properties whose value is `undefined` when casting an update. In other words, if this is set, Mongoose will delete `baz` from the update in `Model.updateOne({}, { foo: 'bar', baz: undefined })` before sending the update to the server.