diff --git a/bidrequest.go b/bidrequest.go
index d8d6873..48bfc65 100644
--- a/bidrequest.go
+++ b/bidrequest.go
@@ -27,7 +27,8 @@ type BidRequest struct {
 	TimeMax           int               `json:"tmax,omitempty"`    // Maximum amount of time in milliseconds to submit a bid
 	Seats             []string          `json:"wseat,omitempty"`   // Array of buyer seats allowed to bid on this auction
 	BlockedSeats      []string          `json:"bseat,omitempty"`   // Array of buyer seats blocked to bid on this auction
-	Languages         []string          `json:"wlang,omitempty"`   // Array of languages for creatives using ISO-639-1-alpha-2
+	Languages         []string          `json:"wlang,omitempty"`   // Allowed list of languages for creatives using ISO-639-1-alpha-2. Omission implies no specific restrictions, but buyers would be advised to consider language attribute in the Device and/or Content objects if available. Only one of wlang or wlangb should be present.
+	LanguagesB        []string          `json:"wlangb,omitempty"`  // Allowed list of languages for creatives using IETF BCP 47I. Omission implies no specific restrictions, but buyers would be advised to consider language attribute in the Device and/or Content objects if available. Only one of wlang or wlangb should be present.
 	AllImpressions    int               `json:"allimps,omitempty"` // Flag to indicate whether exchange can verify that all impressions offered represent all of the impressions available in context, Default: 0
 	Currencies        []string          `json:"cur,omitempty"`     // Array of allowed currencies
 	BlockedCategories []ContentCategory `json:"bcat,omitempty"`    // Blocked Advertiser Categories.
diff --git a/content.go b/content.go
index 1546dab..d4b8d0d 100644
--- a/content.go
+++ b/content.go
@@ -19,6 +19,7 @@ type Content struct {
 	ISRC               string            `json:"isrc,omitempty"`               // International Standard Recording Code conforming to ISO - 3901.
 	Producer           *Producer         `json:"producer,omitempty"`           // The producer.
 	URL                string            `json:"url,omitempty"`                // URL of the content, for buy-side contextualization or review.
+	CategoryTaxonomy   CategoryTaxonomy  `json:"cattax,omitempty"`             // Defines the taxonomy in use.
 	Categories         []ContentCategory `json:"cat,omitempty"`                // Array of IAB content categories that describe the content.
 	ProductionQuality  ProductionQuality `json:"prodq,omitempty"`              // Production quality per IAB's classification.
 	VideoQuality       ProductionQuality `json:"videoquality,omitempty"`       // DEPRECATED. Video quality per IAB's classification.
@@ -31,12 +32,11 @@ type Content struct {
 	SourceRelationship int               `json:"sourcerelationship,omitempty"` // 0 = indirect, 1 = direct.
 	Length             int               `json:"len,omitempty"`                // Length of content in seconds; appropriate for video or audio.
 	Language           string            `json:"language,omitempty"`           // Content language using ISO-639-1-alpha-2.
+	LanguageB          string            `json:"langb,omitempty"`              // Content language using IETF BCP 47. Only one of language or langb should be present.
 	Embeddable         int               `json:"embeddable,omitempty"`         // Indicator of whether or not the content is embeddable (e.g., an embeddable video player), where 0 = no, 1 = yes.
 	Data               []Data            `json:"data,omitempty"`               // Additional content data.
 	Network            *ChannelEntity    `json:"network,omitempty"`            // Details about the network the content is on.
 	Channel            *ChannelEntity    `json:"channel,omitempty"`            // Details about the channel the content is on.
 	KwArray            []string          `json:"kwarray,omitempty"`            // Array of keywords about the site. Only one of ‘keywords’ or‘kwarray’ may be present.
-	CategoryTaxonomy   CategoryTaxonomy  `json:"cattax,omitempty"`             // Defines the taxonomy in use.
-	LangB              string            `json:"langb,omitempty"`              // Language of the creative using IETF BCP 47. Only one of language or langb should be present.
 	Ext                json.RawMessage   `json:"ext,omitempty"`
 }
diff --git a/device.go b/device.go
index 92580d0..485925a 100644
--- a/device.go
+++ b/device.go
@@ -26,7 +26,8 @@ type Device struct {
 	JS           int             `json:"js,omitempty"`             // Javascript status ("0": Disabled, "1": Enabled)
 	GeoFetch     int             `json:"geofetch,omitempty"`       // Indicates if the geolocation API will be available to JavaScript code running in the banner,
 	FlashVersion string          `json:"flashver,omitempty"`       // Flash version
-	Language     string          `json:"language,omitempty"`       // Browser language
+	Language     string          `json:"language,omitempty"`       // Browser language using ISO-639-1-alpha-2. Only one of language or langb should be present.
+	LanguageB    string          `json:"langb,omitempty"`          // Browser language using IETF BCP 47. Only one of language or langb should be present.
 	Carrier      string          `json:"carrier,omitempty"`        // Carrier or ISP derived from the IP address
 	MCCMNC       string          `json:"mccmnc,omitempty"`         // Mobile carrier as the concatenated MCC-MNC code (e.g., "310-005" identifies Verizon Wireless CDMA in the USA).
 	ConnType     ConnType        `json:"connectiontype,omitempty"` // Network connection type.