diff --git a/document/memo.txt b/document/memo.txt
index f68102d..fe27c43 100644
--- a/document/memo.txt
+++ b/document/memo.txt
@@ -5,5 +5,8 @@
 RESTで作られたAPIの一覧
 https://ja.wikipedia.org/wiki/Representational_State_Transfer
 
+Statelessに関する記事
+https://www.glamenv-septzen.net/view/1350#idbb2951
+
 [1]Uri Klein and Kedar S. Namjoshi. (2011) "Formalization and Automated Verification of RESTful Behavior,"
    LNCS 6806, pp. 541–556, 2.3 3. Safety and idempotence.
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