Minor documentation improvement.
diff --git a/include/t1tables.h b/include/t1tables.h
index 632be5a..a6ea415 100644
--- a/include/t1tables.h
+++ b/include/t1tables.h
@@ -492,8 +492,9 @@ FT_BEGIN_HEADER
* FreeType error code. 0~means success.
*
* @note:
- * The string pointers within the font info structure are owned by
- * the face and don't need to be freed by the caller.
+ * String pointers within the @PS_FontInfoRec structure are owned by
+ * the face and don't need to be freed by the caller. Missing entries
+ * in the font's FontInfo dictionary are represented by NULL pointers.
*
* If the font's format is not PostScript-based, this function will
* return the `FT_Err_Invalid_Argument' error code.