diff --git a/Octokit.Tests.Integration/Clients/SearchClientTests.cs b/Octokit.Tests.Integration/Clients/SearchClientTests.cs
index c64d6a02f2..9123ecdc3c 100644
--- a/Octokit.Tests.Integration/Clients/SearchClientTests.cs
+++ b/Octokit.Tests.Integration/Clients/SearchClientTests.cs
@@ -281,6 +281,28 @@ public async Task SearchForAllIssuesUsingTerm()
         Assert.NotEmpty(openedIssues);
     }
 
+    [IntegrationTest]
+    public async Task SearchForLockedUnlockedIssues()
+    {
+
+        var lockedIssuesRequest = new SearchIssuesRequest();
+        lockedIssuesRequest.Repos.Add("octokit", "octokit.net");
+        lockedIssuesRequest.Is = new List<IssueIsQualifier> { IssueIsQualifier.Issue, IssueIsQualifier.Locked };
+
+        var lockedIssues = await _gitHubClient.Search.SearchIssues(lockedIssuesRequest);
+
+        var unlockedIssuesRequest = new SearchIssuesRequest();
+
+        unlockedIssuesRequest.Repos.Add("octokit", "octokit.net");
+        unlockedIssuesRequest.Is = new List<IssueIsQualifier> { IssueIsQualifier.Issue, IssueIsQualifier.Unlocked };
+
+
+        var unlockedIssues = await _gitHubClient.Search.SearchIssues(unlockedIssuesRequest);
+
+        Assert.All(lockedIssues.Items, i => Assert.True(i.Locked));
+        Assert.All(unlockedIssues.Items, i => Assert.False(i.Locked));
+    }
+
     [IntegrationTest]
     public async Task SearchForMergedPullRequests()
     {
diff --git a/Octokit.Tests/Models/SearchIssuesRequestTests.cs b/Octokit.Tests/Models/SearchIssuesRequestTests.cs
index 9227e7a8e0..dfa5e55a69 100644
--- a/Octokit.Tests/Models/SearchIssuesRequestTests.cs
+++ b/Octokit.Tests/Models/SearchIssuesRequestTests.cs
@@ -170,6 +170,17 @@ public void HandlesIsAttributeCorrectly()
             Assert.Contains("is:pr", request.MergedQualifiers());
         }
 
+        [Fact]
+        public void HandlesIsLockedUnlockedAttributeCorrectly()
+        {
+            var request = new SearchIssuesRequest("test");
+            Assert.DoesNotContain(request.MergedQualifiers(), x => x.Contains("is:"));
+
+            request.Is = new List<IssueIsQualifier> { IssueIsQualifier.Locked, IssueIsQualifier.Unlocked };
+            Assert.Contains("is:locked", request.MergedQualifiers());
+            Assert.Contains("is:unlocked", request.MergedQualifiers());
+        }
+
         [Fact]
         public void HandlesStatusAttributeCorrectly()
         {
diff --git a/Octokit/Models/Request/SearchIssuesRequest.cs b/Octokit/Models/Request/SearchIssuesRequest.cs
index acb33c6f47..391e04130a 100644
--- a/Octokit/Models/Request/SearchIssuesRequest.cs
+++ b/Octokit/Models/Request/SearchIssuesRequest.cs
@@ -489,7 +489,11 @@ public enum IssueIsQualifier
         [Parameter(Value = "private")]
         Private,
         [Parameter(Value = "public")]
-        Public
+        Public,
+        [Parameter(Value = "locked")]
+        Locked,
+        [Parameter(Value = "unlocked")]
+        Unlocked
     }
 
     public enum IssueNoMetadataQualifier
diff --git a/docs/search.md b/docs/search.md
index 1c3e1c7f90..95dfdc218b 100644
--- a/docs/search.md
+++ b/docs/search.md
@@ -61,6 +61,14 @@ request.Involves = "terrajobst";
 request.State = ItemState.All;
 // or to just search closed issues
 request.State = ItemState.Closed;
+
+// you can filter by the "Is" qualifier
+// the enum IssueIsQualifier contains the supported values
+// you can filter for locked issues like this:
+request.Is = new List<IssueIsQualifier> {
+  IssueIsQualifier.Issue,
+  IssueIsQualifier.Locked
+};
 ```
 
 There's other options available to control how the results are returned: