init.patch

diff --git a/speech_recognition/__init__.py b/speech_recognition/__init__.py
index d763a9b..a7ab9c9 100644
--- a/speech_recognition/__init__.py
+++ b/speech_recognition/__init__.py
@@ -1665,7 +1665,7 @@ class Recognizer(AudioSource):
                 human_string = self.tflabels[node_id]
                 return human_string
             
-    def recognize_vosk(self, audio_data, language='en'):
+    def recognize_vosk(self, audio_data, language='en', grammar=None):
         from vosk import Model, KaldiRecognizer
         
         assert isinstance(audio_data, AudioData), "Data must be audio data"
@@ -1676,7 +1676,10 @@ class Recognizer(AudioSource):
                 exit (1)
             self.vosk_model = Model("model")
 
-        rec = KaldiRecognizer(self.vosk_model, 16000);
+        if grammar:
+            rec = KaldiRecognizer(self.vosk_model, 16000, grammar)
+        else:
+            rec = KaldiRecognizer(self.vosk_model, 16000)
         
         rec.AcceptWaveform(audio_data.get_raw_data(convert_rate=16000, convert_width=2));
         finalRecognition = rec.FinalResult()