diff --git a/data/actionsmap/yunohost.yml b/data/actionsmap/yunohost.yml
index b7b4eaf88..76500ac13 100644
--- a/data/actionsmap/yunohost.yml
+++ b/data/actionsmap/yunohost.yml
@@ -442,8 +442,10 @@ domain:
                             - "pattern_positive_number"
 
         ### domain_maindomain()
-        maindomain:
+        main-domain:
             action_help: Check the current main domain, or change it
+            deprecated_alias:
+                - maindomain
             api:
                 - GET /domains/main
                 - PUT /domains/main
diff --git a/src/yunohost/domain.py b/src/yunohost/domain.py
index 8529433ee..bed8e6883 100644
--- a/src/yunohost/domain.py
+++ b/src/yunohost/domain.py
@@ -236,7 +236,7 @@ def domain_dns_conf(domain, ttl=None):
 
 
 @is_unit_operation()
-def domain_maindomain(operation_logger, new_main_domain=None):
+def domain_main_domain(operation_logger, new_main_domain=None):
     """
     Check the current main domain, or change it
 
diff --git a/src/yunohost/tools.py b/src/yunohost/tools.py
index 5feb04dec..e33ef8e82 100644
--- a/src/yunohost/tools.py
+++ b/src/yunohost/tools.py
@@ -166,7 +166,8 @@ def tools_adminpw(new_password, check_strength=True):
 
 @is_unit_operation()
 def tools_maindomain(operation_logger, new_main_domain=None):
-    from yunohost.domain import domain_maindomain
+    from yunohost.domain import domain_main_domain
+    logger.warning(m18n.g("deprecated_command_alias", prog="yunohost", old="tools maindomain", new="domain main-domain"))
     return domain_main_domain(new_main_domain=new_main_domain)