diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4bd5953..1c90b58 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 #### Features
 
 - Support basic authentication
+- Support stored procedures (RPC)
 
 ### v0.1.1
 
diff --git a/README.md b/README.md
index 1dccd19..e18ee3f 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,14 @@ PostgREST client for Python. This library provides an ORM interface to PostgREST
 
 ### Instructions
 
+#### With Poetry
+
+```sh
+$ poetry add git+https://github.com/lqmanh/postgrest_py.git#v0.1.1
+```
+
+#### With Pip
+
 ## USAGE
 
 ## DOCUMENTATION
diff --git a/postgrest_py/client.py b/postgrest_py/client.py
index 72275ba..92857c7 100644
--- a/postgrest_py/client.py
+++ b/postgrest_py/client.py
@@ -1,4 +1,4 @@
-from httpx import AsyncClient
+from httpx import AsyncClient, Response
 
 from postgrest_py.request_builder import RequestBuilder
 
@@ -22,7 +22,7 @@ async def __aexit__(self, exc_type, exc, tb) -> None:
     async def aclose(self) -> None:
         await self.session.aclose()
 
-    def auth(self, bearer_token: str, *, username: str = None, password=""):
+    def auth(self, bearer_token: str, *, username: str = None, password: str = None):
         """Authenticate the request, with either bearer token or basic authentication."""
 
         if username:
@@ -44,3 +44,10 @@ def from_(self, table: str) -> RequestBuilder:
         """Alias to Self.from_table()."""
 
         return self.from_table(table)
+
+    async def rpc(self, func: str, params: dict) -> Response:
+        """Execute a stored procedure call."""
+
+        path = f"/rpc/{func}"
+        r = await self.session.post(path, json=params)
+        return r