diff --git a/google/cloud/language/v1beta2/language_service.proto b/google/cloud/language/v1beta2/language_service.proto
index f79d0705..6ddea6dc 100644
--- a/google/cloud/language/v1beta2/language_service.proto
+++ b/google/cloud/language/v1beta2/language_service.proto
@@ -55,8 +55,13 @@ service LanguageService {
     option (google.api.http) = { post: "/v1beta2/documents:analyzeSyntax" body: "*" };
   }
 
-  // A convenience method that provides all syntax, sentiment, and entity
-  // features in one call.
+  // Classifies a document into categories.
+  rpc ClassifyText(ClassifyTextRequest) returns (ClassifyTextResponse) {
+    option (google.api.http) = { post: "/v1beta2/documents:classifyText" body: "*" };
+  }
+
+  // A convenience method that provides all syntax, sentiment, entity, and
+  // classification features in one call.
   rpc AnnotateText(AnnotateTextRequest) returns (AnnotateTextResponse) {
     option (google.api.http) = { post: "/v1beta2/documents:annotateText" body: "*" };
   }
@@ -98,7 +103,7 @@ message Document {
   // The language of the document (if not specified, the language is
   // automatically detected). Both ISO and BCP-47 language codes are
   // accepted.<br>
-  // [Language Support](https://cloud.google.com/natural-language/docs/languages)
+  // [Language Support](/natural-language/docs/languages)
   // lists currently supported languages for each API method.
   // If the language (either specified by the caller or automatically detected)
   // is not supported by the called API method, an `INVALID_ARGUMENT` error
@@ -820,6 +825,16 @@ message TextSpan {
   int32 begin_offset = 2;
 }
 
+// Represents a category returned from the text classifier.
+message ClassificationCategory {
+  // The name of the category representing the document.
+  string name = 1;
+
+  // The classifier's confidence of the category. Number represents how certain
+  // the classifier is that this category represents the given text.
+  float confidence = 2;
+}
+
 // The sentiment analysis request message.
 message AnalyzeSentimentRequest {
   // Input document.
@@ -907,6 +922,18 @@ message AnalyzeSyntaxResponse {
   string language = 3;
 }
 
+// The document classification request message.
+message ClassifyTextRequest {
+  // Input document.
+  Document document = 1;
+}
+
+// The document classification response message.
+message ClassifyTextResponse {
+  // Categories representing the input document.
+  repeated ClassificationCategory categories = 1;
+}
+
 // The request message for the text annotation API, which can perform multiple
 // analysis types (sentiment, entities, and syntax) in one call.
 message AnnotateTextRequest {
@@ -924,6 +951,9 @@ message AnnotateTextRequest {
 
     // Extract entities and their associated sentiment.
     bool extract_entity_sentiment = 4;
+
+    // Classify the full document into categories.
+    bool classify_text = 6;
   }
 
   // Input document.
@@ -960,6 +990,9 @@ message AnnotateTextResponse {
   // in the request or, if not specified, the automatically-detected language.
   // See [Document.language][google.cloud.language.v1beta2.Document.language] field for more details.
   string language = 5;
+
+  // Categories identified in the input document.
+  repeated ClassificationCategory categories = 6;
 }
 
 // Represents the text encoding that the caller uses to process the output.