diff --git a/asyncserial/asyncserial.py b/asyncserial/asyncserial.py
index 522d006..fea8df0 100644
--- a/asyncserial/asyncserial.py
+++ b/asyncserial/asyncserial.py
@@ -33,6 +33,11 @@ async def write_exactly(self, data):
             res = await self.write(data)
             data = data[res:]
 
+    async def readline(self, terminator=b"\n"):
+        data = bytearray()
+        while terminator not in data:
+            data += await self.read_exactly(1)
+        return data
 
 if os.name != "nt":
     class AsyncSerial(AsyncSerialBase):