diff --git a/DevOps/Actions/PrCommentAction.cs b/DevOps/Actions/PrCommentAction.cs
new file mode 100644
index 0000000..99b2799
--- /dev/null
+++ b/DevOps/Actions/PrCommentAction.cs
@@ -0,0 +1,32 @@
+using DevOps.Options;
+using DevOps.Services;
+using DevOps.Utils;
+
+namespace DevOps.Actions;
+
+internal static class PrCommentAction
+{
+    internal static async Task<int> Execute(PrCommentOptions opts, CancellationToken ct)
+    {
+        try
+        {
+            var pr = await HttpService.GetPullRequest(opts.Id, ct);
+            var repo = pr.Repository?.Name;
+            var project = pr.Repository?.Project?.Name;
+            if (string.IsNullOrEmpty(repo) || string.IsNullOrEmpty(project))
+            {
+                ConsoleHelper.WriteError($"Could not resolve the repository for pull request {opts.Id}.");
+                return 1;
+            }
+
+            await HttpService.AddPullRequestComment(project, repo, opts.Id, opts.Message, ct);
+            ConsoleHelper.WriteSuccess($"Comment added to pull request #{opts.Id}.");
+            return 0;
+        }
+        catch (Exception ex)
+        {
+            ConsoleHelper.WriteError($"Error: {ex.Message}");
+            return 1;
+        }
+    }
+}
diff --git a/DevOps/Options/PrCommentOptions.cs b/DevOps/Options/PrCommentOptions.cs
new file mode 100644
index 0000000..e2c44b2
--- /dev/null
+++ b/DevOps/Options/PrCommentOptions.cs
@@ -0,0 +1,13 @@
+using CommandLine;
+
+namespace DevOps.Options;
+
+[Verb("pr-comment", HelpText = "Add a comment to a pull request.")]
+public class PrCommentOptions
+{
+    [Option('i', "id", Required = true, HelpText = "Pull request ID.")]
+    public int Id { get; set; }
+
+    [Option('m', "message", Required = true, HelpText = "Comment text.")]
+    public string Message { get; set; }
+}
diff --git a/DevOps/Program.cs b/DevOps/Program.cs
index 0905498..bc31ae4 100644
--- a/DevOps/Program.cs
+++ b/DevOps/Program.cs
@@ -29,7 +29,8 @@
     typeof(PrOpenOptions),
     typeof(PrVoteOptions),
     typeof(PrAbandonOptions),
-    typeof(PrCompleteOptions)
+    typeof(PrCompleteOptions),
+    typeof(PrCommentOptions)
 };
 
 var result = Parser.Default.ParseArguments(args, optionTypes);
@@ -58,6 +59,7 @@ await result.MapResult(
         PrVoteOptions o => PrVoteAction.Execute(o, cts.Token),
         PrAbandonOptions o => PrAbandonAction.Execute(o, cts.Token),
         PrCompleteOptions o => PrCompleteAction.Execute(o, cts.Token),
+        PrCommentOptions o => PrCommentAction.Execute(o, cts.Token),
         _ => Task.FromResult(1)
     },
     _ => Task.FromResult(1)
diff --git a/DevOps/Responses/AzureDevOpsResponses.cs b/DevOps/Responses/AzureDevOpsResponses.cs
index 16e9e92..35cb40b 100644
--- a/DevOps/Responses/AzureDevOpsResponses.cs
+++ b/DevOps/Responses/AzureDevOpsResponses.cs
@@ -251,6 +251,12 @@ public class PullRequestProject
     public string Name { get; set; }
 }
 
+public class PullRequestThreadResponse
+{
+    [JsonProperty("id")]
+    public int Id { get; set; }
+}
+
 public class IdentityListResponse
 {
     [JsonProperty("value")]
diff --git a/DevOps/Services/HttpService.cs b/DevOps/Services/HttpService.cs
index 01c6277..4e83579 100644
--- a/DevOps/Services/HttpService.cs
+++ b/DevOps/Services/HttpService.cs
@@ -392,6 +392,28 @@ public static async Task VotePullRequest(string project, string repo, int pullRe
             throw new Exception($"Failed to vote on pull request {pullRequestId}. Status: {response.StatusCode}. {response.Content}");
     }
 
+    /// <summary>Adds a top-level comment thread to a pull request, returning the created thread id.</summary>
+    public static async Task<int> AddPullRequestComment(string project, string repo, int pullRequestId, string content, CancellationToken cancellationToken = default)
+    {
+        using var client = await CreateClientAsync(cancellationToken);
+        var request = new RestRequest($"{project}/_apis/git/repositories/{Uri.EscapeDataString(repo)}/pullrequests/{pullRequestId}/threads", Method.Post);
+        request.AddQueryParameter("api-version", API_VERSION);
+
+        var body = new
+        {
+            comments = new[] { new { parentCommentId = 0, content, commentType = 1 } },
+            status = 1
+        };
+        request.AddStringBody(JsonConvert.SerializeObject(body), DataFormat.Json);
+
+        var response = await client.ExecuteAsync(request, cancellationToken);
+
+        if (!response.IsSuccessStatusCode)
+            throw new Exception($"Failed to comment on pull request {pullRequestId}. Status: {response.StatusCode}. {response.Content}");
+
+        return JsonConvert.DeserializeObject<PullRequestThreadResponse>(response.Content)?.Id ?? 0;
+    }
+
     /// <summary>Sets a pull request status (e.g. "abandoned"), returning the updated PR.</summary>
     public static async Task<PullRequestResponse> SetPullRequestStatus(string project, string repo, int pullRequestId, string status, CancellationToken cancellationToken = default)
     {
diff --git a/README.md b/README.md
index b74c035..ec395f4 100644
--- a/README.md
+++ b/README.md
@@ -469,6 +469,21 @@ devops pr-vote -i 123 -v reset
 
 ---
 
+### `pr-comment` — Add a comment to a pull request
+
+Posts a top-level comment thread. Works by PR ID; the repository is resolved automatically.
+
+```powershell
+devops pr-comment -i 123 -m "Looks good, one nit on the naming."
+```
+
+| Option | Alias | Description |
+|---|---|---|
+| `--id` | `-i` | Pull request ID (required) |
+| `--message` | `-m` | Comment text (required) |
+
+---
+
 ### `pr-abandon` — Abandon a pull request
 
 ```powershell