diff --git a/web/src/filter.js b/web/src/filter.js
index 64b7ec37dd..a33a7fb7c5 100644
--- a/web/src/filter.js
+++ b/web/src/filter.js
@@ -999,14 +999,20 @@ export class Filter {
     static describe_is_operator(operator) {
         const verb = operator.negated ? "exclude " : "";
         const operand = operator.operand;
-        const operand_list = ["starred", "alerted", "unread"];
-        if (operand_list.includes(operand)) {
-            return verb + operand + " messages";
-        } else if (operand === "mentioned") {
-            return verb + "@-mentions";
-        } else if (operand === "private") {
-            return verb + "direct messages";
+
+        switch (operand) {
+            case "starred":
+            case "alerted":
+            case "unread":
+                return verb + operand + " messages";
+            case "mentioned":
+                return verb + "@-mentions";
+            case "private":
+                return verb + "direct messages";
+            case "resolved":
+                return verb + "topics marked as resolved";
         }
+
         return "invalid " + operand + " operand for is operator";
     }
 
diff --git a/web/tests/filter.test.js b/web/tests/filter.test.js
index 132152c20b..4417a566d8 100644
--- a/web/tests/filter.test.js
+++ b/web/tests/filter.test.js
@@ -1157,6 +1157,10 @@ test("describe", () => {
     string = "alerted messages";
     assert.equal(Filter.describe(narrow), string);
 
+    narrow = [{operator: "is", operand: "resolved"}];
+    string = "topics marked as resolved";
+    assert.equal(Filter.describe(narrow), string);
+
     narrow = [{operator: "is", operand: "something_we_do_not_support"}];
     string = "invalid something_we_do_not_support operand for is operator";
     assert.equal(Filter.describe(narrow), string);