-for GUI API, include <m17n-gui.h> and <m17n-X.h>. See the
-documementation above, or the manual of m17nIntro(3) for more detail.
+for GUI API, include <m17n-gui.h >. In addition, for those who need
+only text shaping facility that uses FLT (Font Layout Table), the
+library provides FLT API. To use it, include <m17n-flt.h>.
+
+See the documentation above, or the manual of m17nIntro(3) for more
+detail.