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-rw-r--r--changelog.d/17476.doc1
-rw-r--r--docs/usage/configuration/config_documentation.md7
2 files changed, 6 insertions, 2 deletions
diff --git a/changelog.d/17476.doc b/changelog.d/17476.doc
new file mode 100644
index 0000000000..89d8d490bb
--- /dev/null
+++ b/changelog.d/17476.doc
@@ -0,0 +1 @@
+Update the [`allowed_local_3pids`](https://element-hq.github.io/synapse/v1.112/usage/configuration/config_documentation.html#allowed_local_3pids) config option's msisdn address to a working example.
diff --git a/docs/usage/configuration/config_documentation.md b/docs/usage/configuration/config_documentation.md
index 649f4f71c7..40f64be856 100644
--- a/docs/usage/configuration/config_documentation.md
+++ b/docs/usage/configuration/config_documentation.md
@@ -2386,7 +2386,7 @@ enable_registration_without_verification: true
 ---
 ### `registrations_require_3pid`
 
-If this is set, users must provide all of the specified types of 3PID when registering an account.
+If this is set, users must provide all of the specified types of [3PID](https://spec.matrix.org/latest/appendices/#3pid-types) when registering an account.
 
 Note that [`enable_registration`](#enable_registration) must also be set to allow account registration.
 
@@ -2411,6 +2411,9 @@ disable_msisdn_registration: true
 
 Mandate that users are only allowed to associate certain formats of
 3PIDs with accounts on this server, as specified by the `medium` and `pattern` sub-options.
+`pattern` is a [Perl-like regular expression](https://docs.python.org/3/library/re.html#module-re).
+
+More information about 3PIDs, allowed `medium` types and their `address` syntax can be found [in the Matrix spec](https://spec.matrix.org/latest/appendices/#3pid-types).
 
 Example configuration:
 ```yaml
@@ -2420,7 +2423,7 @@ allowed_local_3pids:
   - medium: email
     pattern: '^[^@]+@vector\.im$'
   - medium: msisdn
-    pattern: '\+44'
+    pattern: '^44\d{10}$'
 ```
 ---
 ### `enable_3pid_lookup`