X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Ftypes.h;h=d6c7d10a63e09012e12e2d5221701813d7d94ea6;hp=8e6356eb344f4d94b23323633014bb258dfecb00;hb=5973e0985425c90c72b98d75f3ccbd1c1bb3d446;hpb=22ede4442cd285d7365b9497c3be65fb2c66b4be

diff --git a/src/types.h b/src/types.h
index 8e6356eb..d6c7d10a 100644
--- a/src/types.h
+++ b/src/types.h
@@ -70,6 +70,10 @@ typedef uint64_t Bitboard;
 //// -DUSE_POPCNT   | Add runtime support for use of popcnt asm-instruction.
 ////                | Works only in 64-bit mode. For compiling requires hardware
 ////                | with popcnt support. Around 4% speed-up.
+////
+//// -DOLD_LOCKS    | By default under Windows are used the fast Slim Reader/Writer (SRW)
+////                | Locks and Condition Variables: these are not supported by Windows XP
+////                | and older, to compile for those platforms you should enable OLD_LOCKS.
 
 // Automatic detection for 64-bit under Windows
 #if defined(_WIN64)