diff --git a/Development-Side-Notes.md b/Development-Side-Notes.md
index 39cbc46..6598f12 100644
--- a/Development-Side-Notes.md
+++ b/Development-Side-Notes.md
@@ -3,4 +3,5 @@ Just a note for some traps and useful things for development.
 - node-bullseye image is not working on Raspberry Pi (armv7), need to downgrade to node-buster.
 - node-alpine3.13 image is not working on Raspberry Pi (armv7), need to downgrade to alpine 3.12.
 - docker-alpine's dns is actually not stable in some systems.
-- [CSS] do not use any system-ui fonts, the fonts will be difference in difference Windows Languages
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+- [CSS] do not use any system-ui fonts, the fonts will be difference in difference Windows Languages
+- [Unit Test] Vue suggested Jest, but what, you cannot run the test in a browser, it is so stupid because all browser functions cannot be tested (localStorage, DOM and more).
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