diff --git a/winbuild/BUILD.WINDOWS.txt b/winbuild/BUILD.WINDOWS.txt
index 7b0d5ba86..1840991fe 100644
--- a/winbuild/BUILD.WINDOWS.txt
+++ b/winbuild/BUILD.WINDOWS.txt
@@ -71,6 +71,7 @@ where <options> is one or many of:
                                  Libraries can be fetched at http://windows.php.net/downloads/php-sdk/deps/
                                  Uncompress them into the deps folder.
   WITH_SSL=<dll or static>     - Enable OpenSSL support, DLL or static
+  WITH_NGHTTP2=<dll or static> - Enable HTTP/2 support, DLL or static
   WITH_MBEDTLS=<dll or static> - Enable mbedTLS support, DLL or static
   WITH_CARES=<dll or static>   - Enable c-ares support, DLL or static
   WITH_ZLIB=<dll or static>    - Enable zlib support, DLL or static