kc3-lang/freetype

diff --git a/include/freetype/freetype.h b/include/freetype/freetype.h
index 586e170..360ba3c 100644
--- a/include/freetype/freetype.h
+++ b/include/freetype/freetype.h
@@ -337,6 +337,9 @@ FT_BEGIN_HEADER
   /*    It also embeds a memory manager (see @FT_Memory), as well as a     */
   /*    scan-line converter object (see @FT_Raster).                       */
   /*                                                                       */
+  /*    For multi-threading applications each thread should have its own   */
+  /*    FT_Library object.                                                 */
+  /*                                                                       */
   /* <Note>                                                                */
   /*    Library objects are normally created by @FT_Init_FreeType, and     */
   /*    destroyed with @FT_Done_FreeType.                                  */