diff --git a/help/YATEXHLP.jp b/help/YATEXHLP.jp
index ecf3e2c..c1fab92 100644
--- a/help/YATEXHLP.jp
+++ b/help/YATEXHLP.jp
@@ -1805,6 +1805,95 @@
 \textbackslash
 �o�b�N�X���b�V�����̂���
 
+FILTER
+%#BEGIN FILTER{OUTPUT}{COMMANDLINE}  ... %#END
+\if0 ���� \fi �܂łɈ͂܂ꂽ�̈�A�������� %#SRC{...} �Ŏw�肳�ꂽ�t�@�C����
+�O���v���O���� COMMANDLINE �̕W�����͂Ƃ��ēn���AOUTPUT�t�@�C�����쐬������B
+
+.blockdiag
+%#BEGIN FILTER{OUTPUT}{blockdiag -T %t -o %o -}  ... %#END
+<refer FILTER>
+
+http://blockdiag.com/ja/
+blockdiag �ɂ��e�L�X�g���O���t�摜�ϊ���p�����������B
+LaTeX�\�[�X���Ɉȉ��̂悤�ɏ����Ă���
+
+%#BEGIN FILTER{graph.png}{blockdiag -T %t -o %o -}
+\if0
+===
+blockdiag {
+  default_fontsize = 24;
+    A -> B;
+}
+===
+\fi
+%#END
+
+�����āABEGIN...END�̗̈���� [prefix] t e (�‹��^�C�v�Z�b�g)���ĂԂ�
+2�‚� === �ň͂܂ꂽ��������͂Ƃ���
+
+	blockdiag -T png -o graph.png -
+
+���Ă΂�A[ A ] -> [ B ] �̂悤�ȃO���t�� graph.png �ɓ�����B
+�����LaTeX�{������ \includegraphics ����Ή摜�̃\�[�X��{���Ɠ���
+�t�@�C���ňꌳ�Ǘ��ł���B
+
+�摜�̃\�[�X��ʃt�@�C��(���Ƃ��� src.diag)�ɂ������ꍇ�͈ȉ��̂悤�ɂ���B
+
+%#BEGIN FILTER{graph.png}{blockdiag -T %t -o %o -}
+%#SRC{src.diag}
+%#END
+
+
+.nwdiag
+%#BEGIN FILTER{OUTPUT}{nwdiag -T %t -o %o -}  ... %#END
+<refer .blockdiag>
+
+.seqdiag
+%#BEGIN FILTER{OUTPUT}{seqdiag -T %t -o %o -}  ... %#END
+<refer .blockdiag>
+
+.actdiag
+%#BEGIN FILTER{OUTPUT}{actdiag -T %t -o %o -}  ... %#END
+<refer .blockdiag>
+
+.rackdiag
+%#BEGIN FILTER{OUTPUT}{rackdiag -T %t -o %o -}  ... %#END
+<refer .blockdiag>
+
+.dot
+%#BEGIN FILTER{OUTPUT}{dot -T %t -o %o}  ... %#END
+<refer FILTER>
+
+http://www.graphviz.org/
+https://ja.wikipedia.org/wiki/Graphviz
+Graphviz �ɂ��e�L�X�g���O���t�摜�ϊ���p�����������B
+LaTeX�\�[�X���Ɉȉ��̂悤�ɏ����Ă���
+
+%#BEGIN FILTER{graph.png}{dot -T %t -o %o}
+\if0
+===
+digraph {
+  graph [charset="utf-8"]
+    A -> B
+}
+===
+\fi
+
+�����āABEGIN...END�̗̈���� [prefix] t e (�‹��^�C�v�Z�b�g)���ĂԂ�
+2�‚� === �ň͂܂ꂽ��������͂Ƃ���
+
+	dot -T png -o graph.png
+
+���Ă΂�A
+
+    [ A ]
+     ��
+    [ B ]
+
+�̂悤�ȃO���t�� graph.png �ɓ�����B
+
+
 LaiTeX
 a Little Assistant Interface for TeX on Vz
 �����炭���Ȃ����� Vz ��Ŏg���Ă��邱�̃��[�h�B