diff --git a/explanation/instancecolor.md b/explanation/instancecolor.md
new file mode 100644
index 000000000..8ca910029
--- /dev/null
+++ b/explanation/instancecolor.md
@@ -0,0 +1,6 @@
+`packages/backend/src/server/web/views/base.pug` の中の
+```
+meta(name='theme-color' content='#好きな色')
+meta(name='theme-color-orig' content='#好きな色')
+```
+の色の部分を変更する(Hex値)