diff --git a/src/ltui/base/bit.lua b/src/ltui/base/bit.lua
index fcd5765..7d2bc65 100644
--- a/src/ltui/base/bit.lua
+++ b/src/ltui/base/bit.lua
@@ -26,5 +26,10 @@ function bit.band(a, b)
     return a & b
 end
 
+-- bit/or operation
+function bit.bor(a, b)
+    return a | b
+end
+
 -- load bit module
 return bit