diff --git a/trustgraph/model/text_completion/cohere/llm.py b/trustgraph/model/text_completion/cohere/llm.py
index 5d8ba57c..ce1aa364 100755
--- a/trustgraph/model/text_completion/cohere/llm.py
+++ b/trustgraph/model/text_completion/cohere/llm.py
@@ -62,7 +62,7 @@ class Processor(ConsumerProducer):
         output = self.cohere.chat( 
         model=self.model,
         message=prompt,
-        preamble = "You are a helpful AI-assistant."
+        preamble = "You are a helpful AI-assistant.",
         temperature=0.0,
         chat_history=[],
         prompt_truncation='auto',