diff --git a/blockchain.py b/blockchain.py
index ff80bb0..9de43dd 100644
--- a/blockchain.py
+++ b/blockchain.py
@@ -25,7 +25,14 @@ class Blockchain:
         """
 
         parsed_url = urlparse(address)
-        self.nodes.add(parsed_url.netloc)
+        if parsed_url.netloc:
+            self.nodes.add(parsed_url.netloc)
+        elif parsed_url.path:
+            # Accepts an URL without scheme like '192.168.0.5:5000'.
+            self.nodes.add(parsed_url.path)
+        else:
+            raise ValueError('Invalid URL')
+
 
     def valid_chain(self, chain):
         """