1 files changed, 1 insertions, 0 deletions

diff --git a/README b/README
index 35fe6d2..0dd19b9 100644
--- a/README
+++ b/README
@@ -10,6 +10,7 @@ Macro definitions:
 
 	_SLIBC_SOURCE             -- Enable slibc extensions.
 	_GNU_SOURCE               -- Enable glibc extensions (GNU extensions.)
+	_BSD_SOURCE               -- Enable BSD extensions.
 	_SLIBC_SUPPRESS_WARNINGS  -- Suppress all #warning, this is primarily
 	                               intended to be used when compiling slibc.
 	_PORTABLE_SOURCE          -- Unconditionally disable all extensions.