diff --git a/src/GPTApiService.php b/src/GPTApiService.php
index bb56fd0..b262053 100644
--- a/src/GPTApiService.php
+++ b/src/GPTApiService.php
@@ -58,6 +58,14 @@ class GPTApiService {
     // Preparing payload for GPT API Call.
     $url = $config->get('completion_endpoint');
     $model = $config->get('model_name');
+    $message[] = [
+        "role" => "system",
+        "content" => "You are a translation assistant. 
+        1. Always translate between German and English, depending on the source language.
+        2. Ensure that spelling and grammar are optimized: for German, use Swiss German orthography; for English, use US English.
+        3. When encountering HTML code, translate only the content/text and preserve the HTML tags and structure exactly as provided.
+        4. Translate the given text exactly as specified, without adding any extra explanations or modifying names, titles, or specific terms."
+    ];
     $message[] = [
       "role" => "user",
       "content" => $prompt_text,