diff --git a/README.txt b/README.txt
index 86e6642..e550b8a 100644
--- a/README.txt
+++ b/README.txt
@@ -54,6 +54,8 @@ Besides moves, the following commands are available:
 
 Primary testing was done on nawk and busybox awk, but the game should work
 correctly on mawk, gawk and any other POSIX-compliant AWK implementation.
+Partcularly, additional tweaking had been done to make sure the game works
+correctly with gawk --posix and mawk -W posix flags.
 
 == Credits ==