diff --git a/src/mod_bosh.erl b/src/mod_bosh.erl
index 37a7fa809..059058a3b 100644
--- a/src/mod_bosh.erl
+++ b/src/mod_bosh.erl
@@ -244,7 +244,8 @@ mod_doc() ->
            {ram_db_type,
             #{value => "mnesia | sql | redis",
               desc =>
-                  ?T("Same as _`default_ram_db`_ but applied to this module only.")}},
+                  ?T("Same as top-level _`default_ram_db`_ option, "
+                     "but applied to this module only.")}},
            {use_cache,
             #{value => "true | false",
               desc =>
diff --git a/src/mod_muc.erl b/src/mod_muc.erl
index 72f386b00..fd0f12294 100644
--- a/src/mod_muc.erl
+++ b/src/mod_muc.erl
@@ -1424,14 +1424,13 @@ mod_doc() ->
            {db_type,
             #{value => "mnesia | sql",
               desc =>
-                  ?T("Define the type of persistent storage where the module will "
-                     "store room information. The default is the storage defined "
-                     "by the global option 'default_db', or 'mnesia' if omitted.")}},
+                  ?T("Same as top-level _`default_db`_ option, "
+                     "but applied to this module only.")}},
            {ram_db_type,
             #{value => "mnesia | sql",
               desc =>
-                  ?T("Define the type of volatile (in-memory) storage where the module "
-                     "will store room information ('muc_online_room' and 'muc_online_users').")}},
+                  ?T("Same as top-level _`default_ram_db`_ option, "
+                     "but applied to this module only.")}},
            {hibernation_timeout,
             #{value => "infinity | Seconds",
               desc =>
diff --git a/src/mod_proxy65.erl b/src/mod_proxy65.erl
index ce1c67a36..4b4f02c03 100644
--- a/src/mod_proxy65.erl
+++ b/src/mod_proxy65.erl
@@ -173,8 +173,8 @@ mod_doc() ->
            {ram_db_type,
             #{value => "mnesia | redis | sql",
               desc =>
-                  ?T("Define the type of volatile (in-memory) storage where the module "
-                     "will store room information.")}},
+                  ?T("Same as top-level _`default_ram_db`_ option, "
+                     "but applied to this module only.")}},
            {ip,
             #{value => ?T("IPAddress"),
               desc =>
diff --git a/src/mod_shared_roster.erl b/src/mod_shared_roster.erl
index f92e16496..b590578df 100644
--- a/src/mod_shared_roster.erl
+++ b/src/mod_shared_roster.erl
@@ -1276,11 +1276,8 @@ mod_doc() ->
           [{db_type,
             #{value => "mnesia | sql",
               desc =>
-                  ?T("Define the type of storage where the module will create "
-		     "the tables and store user information. The default is "
-		     "the storage defined by the top-level _`default_db`_ option, "
-		     "or 'mnesia' if omitted. If 'sql' value is defined, "
-		     "make sure you have defined the database.")}},
+                  ?T("Same as top-level _`default_db`_ option, "
+                     "but applied to this module only.")}},
            {use_cache,
             #{value => "true | false",
               desc =>