diff --git a/src/milestone.rs b/src/milestone.rs
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+/*
+ * Copyright (C) 2023  Aravinth Manivannan <realaravinth@batsense.net>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+//! Milestone associated to a repository within a forge
+use serde::{Deserialize, Serialize};
+
+use crate::OpenCloseState;
+
+/// Milestone associated to a repository within a forge
+#[derive(Clone, Debug, Serialize, Deserialize, Default, Eq, PartialEq)]
+pub struct Milestone {
+    /// Unique identifier
+    pub index: usize,
+
+    /// Short description
+    pub title: String,
+
+    /// Long, multiline, description
+    pub description: String,
+
+    // TODO: add validation for format "date-time"
+    /// Deadline after which the milestone is overdue
+    pub deadline: Option<String>,
+
+    // TODO: add validation for format "date-time"
+    /// Creating time
+    pub created: String,
+
+    // TODO: add validation for format "date-time"
+    /// Last update time
+    pub updated: String,
+
+    // TODO: add validation for format "date-time"
+    /// The last time 'state' changed to 'closed'
+    pub closed: String,
+
+    /// A 'closed' milestone will not see any activity in the future, otherwise it is 'open'.
+    pub state: OpenCloseState,
+}