diff --git a/llama_cpp/llama.py b/llama_cpp/llama.py
index b23280d..c573add 100644
--- a/llama_cpp/llama.py
+++ b/llama_cpp/llama.py
@@ -1435,6 +1435,8 @@ class Llama:
     def create_chat_completion(
         self,
         messages: List[ChatCompletionMessage],
+        functions: Optional[List[ChatCompletionFunction]] = None,
+        function_call: Optional[Union[str, ChatCompletionFunctionCall]] = None,
         temperature: float = 0.2,
         top_p: float = 0.95,
         top_k: int = 40,
diff --git a/llama_cpp/llama_types.py b/llama_cpp/llama_types.py
index 6ba8023..19f9452 100644
--- a/llama_cpp/llama_types.py
+++ b/llama_cpp/llama_types.py
@@ -63,6 +63,16 @@ class ChatCompletionMessage(TypedDict):
     user: NotRequired[str]
 
 
+class ChatCompletionFunction(TypedDict):
+    name: str
+    description: NotRequired[str]
+    parameters: Dict[str, Any]  # TODO: make this more specific
+
+
+class ChatCompletionFunctionCall(TypedDict):
+    name: str
+
+
 class ChatCompletionChoice(TypedDict):
     index: int
     message: ChatCompletionMessage
diff --git a/llama_cpp/server/app.py b/llama_cpp/server/app.py
index 8a9b818..36763f2 100644
--- a/llama_cpp/server/app.py
+++ b/llama_cpp/server/app.py
@@ -446,6 +446,14 @@ class CreateChatCompletionRequest(BaseModel):
     messages: List[ChatCompletionRequestMessage] = Field(
         default=[], description="A list of messages to generate completions for."
     )
+    functions: Optional[List[llama_cpp.ChatCompletionFunction]] = Field(
+        default=None,
+        description="A list of functions to apply to the generated completions.",
+    )
+    function_call: Optional[Union[str, llama_cpp.ChatCompletionFunctionCall]] = Field(
+        default=None,
+        description="A function to apply to the generated completions.",
+    )
     max_tokens: int = max_tokens_field
     temperature: float = temperature_field
     top_p: float = top_p_field