Clarify the usecase for an msisdn delegate (#8734)

Signed-off-by: Adrian Wannenmacher <tfld@tfld.dev>

1 files changed, 3 insertions, 2 deletions

diff --git a/docs/sample_config.yaml b/docs/sample_config.yaml

index c0cd009230..e9e77ca94e 100644
--- a/docs/sample_config.yaml
+++ b/docs/sample_config.yaml
@@ -1230,8 +1230,9 @@ account_validity:
 # email will be globally disabled.
 #
 # Additionally, if `msisdn` is not set, registration and password resets via msisdn
-# will be disabled regardless. This is due to Synapse currently not supporting any
-# method of sending SMS messages on its own.
+# will be disabled regardless, and users will not be able to associate an msisdn
+# identifier to their account. This is due to Synapse currently not supporting
+# any method of sending SMS messages on its own.
 #
 # To enable using an identity server for operations regarding a particular third-party
 # identifier type, set the value to the URL of that identity server as shown in the