diff --git a/modules/clan/prometheus/default.nix b/modules/clan/prometheus/default.nix
index 9a9980c..f3889d6 100644
--- a/modules/clan/prometheus/default.nix
+++ b/modules/clan/prometheus/default.nix
@@ -45,7 +45,47 @@
               type = with lib.types; str;
               description = "Matrix user for the bot";
             };
-            matrixRooms = options.services.matrix-alertmanager.matrixRooms;
+            matrixRooms = lib.mkOption {
+              type = lib.types.listOf (
+                lib.types.submodule {
+                  options = {
+                    receivers = lib.mkOption {
+                      type = lib.types.listOf lib.types.str;
+                      description = "List of receivers for this room";
+                    };
+                    roomId = lib.mkOption {
+                      type = lib.types.str;
+                      description = "Matrix room ID";
+                      apply =
+                        x:
+                        assert lib.assertMsg (lib.hasPrefix "!" x) "Matrix room ID must start with a '!'. Got: ${x}";
+                        x;
+                    };
+                  };
+                }
+              );
+              description = ''
+                Combination of Alertmanager receiver(s) and rooms for the bot to join.
+                Each Alertmanager receiver can be mapped to post to a matrix room.
+
+                Note, you must use a room ID and not a room alias/name. Room IDs start
+                with a "!".
+              '';
+              example = [
+                {
+                  receivers = [
+                    "receiver1"
+                    "receiver2"
+                  ];
+                  roomId = "!roomid@example.com";
+                }
+                {
+                  receivers = [ "receiver3" ];
+                  roomId = "!differentroomid@example.com";
+                }
+              ];
+            };
+
           };
         };
       };
@@ -170,7 +210,7 @@
                           '';
                         }
                       ]
-                      ++ settings.extraRules;
+                      ++ settings.extra_rules;
                     }
                   ];
                 })