diff --git a/nixos/modules/programs/tsm-client.nix b/nixos/modules/programs/tsm-client.nix
index 65d4db7834ff..421beec86e50 100644
--- a/nixos/modules/programs/tsm-client.nix
+++ b/nixos/modules/programs/tsm-client.nix
@@ -144,7 +144,7 @@ let
     };
     config.name = mkDefault name;
     # Client system-options file directives are explained here:
-    # https://www.ibm.com/support/knowledgecenter/SSEQVQ_8.1.8/client/c_opt_usingopts.html
+    # https://www.ibm.com/docs/en/spectrum-protect/8.1.13?topic=commands-processing-options
     config.extraConfig =
       mapAttrs (lib.trivial.const mkDefault) (
         {
diff --git a/nixos/modules/services/backup/tsm.nix b/nixos/modules/services/backup/tsm.nix
index 6c238745797e..d138e163e34f 100644
--- a/nixos/modules/services/backup/tsm.nix
+++ b/nixos/modules/services/backup/tsm.nix
@@ -88,7 +88,7 @@ in
       # TSM needs a HOME dir to store certificates.
       environment.HOME = "/var/lib/tsm-backup";
       # for exit status description see
-      # https://www.ibm.com/support/knowledgecenter/en/SSEQVQ_8.1.8/client/c_sched_rtncode.html
+      # https://www.ibm.com/docs/en/spectrum-protect/8.1.13?topic=clients-client-return-codes
       serviceConfig.SuccessExitStatus = "4 8";
       # The `-se` option must come after the command.
       # The `-optfile` option suppresses a `dsm.opt`-not-found warning.