diff --git a/src/entities/chain/model.ts b/src/entities/chain/model.ts
index c0a0ecf..a6c6e1e 100644
--- a/src/entities/chain/model.ts
+++ b/src/entities/chain/model.ts
@@ -1,5 +1,8 @@
 import { create } from "zustand";
 import type { Chain } from "./schema";
+import type { Action } from "../action/schema";
+
+const DEFAULT_WAIT_FOR = 60; // Seconds
 
 interface ChainState {
   chains?: Chain[];
@@ -8,6 +11,7 @@ interface ChainState {
   getChain: (id: string) => Chain | null;
   updateChain: (chain: Chain) => void;
   deleteChain: (id: string) => void;
+  addCommentAction: (chainId: string, action: Action) => void;
 }
 
 export const useChainState = create<ChainState>((set, get) => ({
@@ -59,4 +63,29 @@ export const useChainState = create<ChainState>((set, get) => ({
         ],
       };
     }),
+
+  addCommentAction: (chainId, action) =>
+    set((state) => {
+      const chains = state.chains;
+      if (!chains) return state;
+
+      const chainIndex = chains.findIndex((value) => value._id === chainId);
+      if (chainIndex === -1) return state;
+
+      const actions = chains[chainIndex].actions;
+
+      if (typeof actions === "undefined" || actions.length === 0) {
+        chains[chainIndex].actions = [action];
+        return state;
+      }
+
+      const lastAction = actions.at(-1)!;
+
+      if (lastAction.actionType === "comment")
+        actions.push({ actionType: "wait", waitFor: DEFAULT_WAIT_FOR });
+
+      actions.push(action);
+      chains[chainIndex].actions = actions;
+      return state;
+    }),
 }));