diff --git a/docs/signup.md b/docs/signup.md
index dcc589041b..7372ad2204 100644
--- a/docs/signup.md
+++ b/docs/signup.md
@@ -394,7 +394,7 @@ The account is created!
 
 Some homeservers may require the user to enter MSISDN.
 
-On matrix.org, it's not required, and not even optional, but it's still possible for the app to add a MSIS+Dn during the registration.
+On matrix.org, it's not required, and not even optional, but it's still possible for the app to add a MSISDN during the registration.
 
 The user enter a phone number and select a country, the `client_secret` is generated by the application