diff --git a/_posts/2021-10-19-indoors.md b/_posts/2021-10-19-indoors.md
index 2e7836e..c3401f5 100644
--- a/_posts/2021-10-19-indoors.md
+++ b/_posts/2021-10-19-indoors.md
@@ -36,3 +36,5 @@ postcards.
 
 _this post first appeared at 
 [the forum of Postcrossing](https://community.postcrossing.com/t/where-to-find-postcards-in-singapore/222304)_
+
+_P.S. Update, as of 23 December 2021: I've just terminated my account at https://www.postcrossing.com/ as I fear that sending postcards around the world may damage the environment._