diff --git a/errno/errno.py b/errno/errno.py
index c4cb3fed..cd171b3e 100644
--- a/errno/errno.py
+++ b/errno/errno.py
@@ -33,4 +33,5 @@ EPIPE   = 32  # Broken pipe
 EDOM    = 33  # Math argument out of domain of func
 ERANGE  = 34  # Math result not representable
 EAFNOSUPPORT = 97 # Address family not supported by protocol
+ETIMEDOUT = 110 # Connection timed out
 EINPROGRESS = 115 # Operation now in progress