diff --git a/README b/README
index cac0d6dd..155f7de2 100644
--- a/README
+++ b/README
@@ -15,8 +15,8 @@ Vkd3d generates some of its headers from IDL files. If you are using the
 release tarballs, then these headers are pre-generated and are included. If
 you are building from git, then they will be generated at build-time using
 widl. By default, vkd3d will use the widl found in `PATH'. If widl is not
-available or is not recent (>= 3.20), then you can build Wine with `make
-tools/widl' to avoid building all of Wine. You can then point vkd3d's
+available or is not recent (>= 3.21), then you can build Wine with `make
+tools/widl/widl' to avoid building all of Wine. You can then point vkd3d's
 configure at that widl binary with `WIDL="/path/to/widl"'.
 
 For release builds, you may want to define NDEBUG. If you do not need debug log
diff --git a/configure.ac b/configure.ac
index b58c2f4d..213ab22e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,7 +27,7 @@ AC_PROG_CC
 AM_PROG_CC_C_O
 AC_PROG_SED
 AC_PROG_MKDIR_P
-VKD3D_PROG_WIDL(3, 20)
+VKD3D_PROG_WIDL(3, 21)
 AS_IF([test "x$WIDL" = "xno"], [AC_MSG_WARN([widl is required to build header files.])])
 
 AC_CHECK_PROGS([FLEX], [flex], [none])