diff --git a/manim_voiceover/services/openai.py b/manim_voiceover/services/openai.py
index 025fc40..21a574b 100644
--- a/manim_voiceover/services/openai.py
+++ b/manim_voiceover/services/openai.py
@@ -79,6 +79,8 @@ def generate_from_text(
         if not (0.25 <= speed <= 4.0):
             raise ValueError("The speed must be between 0.25 and 4.0.")
 
+        instructions = kwargs.get('instructions', self.additional_kwargs.get('instructions'))
+
         input_text = remove_bookmarks(text)
         input_data = {
             "input_text": input_text,
@@ -87,6 +89,7 @@ def generate_from_text(
                 "voice": self.voice,
                 "model": self.model,
                 "speed": speed,
+                "instructions": instructions,
             },
         }
 
@@ -107,6 +110,7 @@ def generate_from_text(
             voice=self.voice,
             input=input_text,
             speed=speed,
+            instructions=instructions,
         )
         response.stream_to_file(str(Path(cache_dir) / audio_path))