diff --git a/lib/diameter/src/base/diameter_service.erl b/lib/diameter/src/base/diameter_service.erl
index 7d1dd96bf636..83eaa5e0e668 100644
--- a/lib/diameter/src/base/diameter_service.erl
+++ b/lib/diameter/src/base/diameter_service.erl
@@ -24,6 +24,7 @@
 
 -module(diameter_service).
 %% -moduledoc false.
+-moduledoc(#{since => "OTP @OTP-19126@"}).
 -behaviour(gen_server).
 
 %% towards diameter_service_sup
@@ -87,6 +88,7 @@
 -define(WD_REOPEN,  reopen).
 
 -doc "State of the watchdog".
+-doc(#{since => <<"OTP @OTP-19126@">>}).
 -type wd_state() :: ?WD_INITIAL
                   | ?WD_OKAY
                   | ?WD_SUSPECT