diff --git a/fin_defs/__init__.py b/fin_defs/__init__.py
index 82c2f16..bba5de2 100644
--- a/fin_defs/__init__.py
+++ b/fin_defs/__init__.py
@@ -219,6 +219,7 @@ WELL_KNOWN_SYMBOLS = (
             'CZK',
         ]
     }
+    | { 'XXBT': BTC }
     | {str(k): k for k in COMMON_NAMES}
     | {'SPX500': SPX, 'SP500': SPX, 'Nasdaq 100': NDX}
 )