diff --git a/changelog.d/12260.misc b/changelog.d/12260.misc
new file mode 100644
index 0000000000000000000000000000000000000000..deacf034deaee2d1c4f9440c83d1351dabe93417
--- /dev/null
+++ b/changelog.d/12260.misc
@@ -0,0 +1 @@
+Reword 'Choose your user name' as 'Choose your account name' in the SSO registration template, in order to comply with SIWA guidelines.
\ No newline at end of file
diff --git a/synapse/res/templates/sso_auth_account_details.html b/synapse/res/templates/sso_auth_account_details.html
index 41315e4fd4da8b184acdd25573ffa0ab74a0bf52..b231aace01e6e35a65dfb523c5f9b62c19eacf7a 100644
--- a/synapse/res/templates/sso_auth_account_details.html
+++ b/synapse/res/templates/sso_auth_account_details.html
@@ -130,7 +130,7 @@
</head>
<body>
<header>
- <h1>Choose your user name</h1>
+ <h1>Choose your account name</h1>
<p>This is required to create your account on {{ server_name }}, and you can't change this later.</p>
</header>
<main>