Minor doc improvement. Suggested by Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com>.
diff --git a/include/freetype/freetype.h b/include/freetype/freetype.h
index 3e51dab..28aef97 100644
--- a/include/freetype/freetype.h
+++ b/include/freetype/freetype.h
@@ -329,8 +329,8 @@ 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. */
+ /* In multi-threaded applications, make sure that the same FT_Library */
+ /* object or any of its children doesn't get accessed in parallel. */
/* */
/* <Note> */
/* Library objects are normally created by @FT_Init_FreeType, and */