diff --git a/tests/t20047/.clang-uml b/tests/t20047/.clang-uml
new file mode 100644
index 00000000..3cb8298f
--- /dev/null
+++ b/tests/t20047/.clang-uml
@@ -0,0 +1,13 @@
+add_compile_flags:
+  - -fparse-all-comments
+diagrams:
+  t20047_sequence:
+    type: sequence
+    glob:
+      - t20047.cc
+    include:
+      namespaces:
+        - clanguml::t20047
+    using_namespace: clanguml::t20047
+    from:
+      - function: "clanguml::t20047::tmain()"
\ No newline at end of file
diff --git a/tests/t20047/t20047.cc b/tests/t20047/t20047.cc
new file mode 100644
index 00000000..4444c54d
--- /dev/null
+++ b/tests/t20047/t20047.cc
@@ -0,0 +1,42 @@
+#include <future>
+
+namespace clanguml {
+namespace t20047 {
+
+int a1(int x) { return x + 1; }
+
+int a2(int x) { return x + 2; }
+
+int a3(int x) { return x + 3; }
+
+int a4(int x) { return x + 4; }
+
+int a5(int x) { return x + 5; }
+
+int a6(int x) { return x + 6; }
+
+int run(int (*f)(int), int arg) { return f(arg); }
+
+int tmain()
+{
+    auto res =
+        // \uml{call clanguml::t20047::a1(int)}
+        run(a1, 0);
+
+    res = a3(
+        // \uml{call clanguml::t20047::a2(int)}
+        run(a2, 0));
+
+    // \uml{call clanguml::t20047::a4(int)}
+    res = [](auto &&x) { return a4(x); }(0);
+
+    // \uml{call clanguml::t20047::a5(int)}
+    res = std::async(a5, 10).get();
+
+    // \uml{call clanguml::t20047::a6(int)}
+    res = [](auto &&x) { return std::async(run, a6, x).get(); }(1);
+
+    return res;
+}
+}
+}
\ No newline at end of file
diff --git a/tests/t20047/test_case.h b/tests/t20047/test_case.h
new file mode 100644
index 00000000..3643c2db
--- /dev/null
+++ b/tests/t20047/test_case.h
@@ -0,0 +1,65 @@
+/**
+ * tests/t20047/test_case.h
+ *
+ * Copyright (c) 2021-2024 Bartek Kryza <bkryza@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+TEST_CASE("t20047", "[test-case][sequence]")
+{
+    auto [config, db] = load_config("t20047");
+
+    auto diagram = config.diagrams["t20047_sequence"];
+
+    REQUIRE(diagram->name == "t20047_sequence");
+
+    auto model = generate_sequence_diagram(*db, diagram);
+
+    REQUIRE(model->name() == "t20047_sequence");
+
+    {
+        auto src = generate_sequence_puml(diagram, *model);
+        AliasMatcher _A(src);
+
+        REQUIRE_THAT(src, StartsWith("@startuml"));
+        REQUIRE_THAT(src, EndsWith("@enduml\n"));
+
+        // Check if all calls exist
+        REQUIRE_THAT(src, HasCall(_A("tmain()"), _A("a1(int)"), ""));
+        REQUIRE_THAT(src, HasCall(_A("tmain()"), _A("a2(int)"), ""));
+        REQUIRE_THAT(src, HasCall(_A("tmain()"), _A("a3(int)"), ""));
+        REQUIRE_THAT(src, HasCall(_A("tmain()"), _A("a4(int)"), ""));
+        REQUIRE_THAT(src, HasCall(_A("tmain()"), _A("a5(int)"), ""));
+        REQUIRE_THAT(src, HasCall(_A("tmain()"), _A("a6(int)"), ""));
+
+        save_puml(config.output_directory(), diagram->name + ".puml", src);
+    }
+
+    {
+        auto j = generate_sequence_json(diagram, *model);
+
+        using namespace json;
+
+        save_json(config.output_directory(), diagram->name + ".json", j);
+    }
+
+    {
+        auto src = generate_sequence_mermaid(diagram, *model);
+
+        mermaid::AliasMatcher _A(src);
+        using mermaid::IsClass;
+
+        save_mermaid(config.output_directory(), diagram->name + ".mmd", src);
+    }
+}
\ No newline at end of file
diff --git a/tests/test_cases.cc b/tests/test_cases.cc
index 3253c6ae..cb715570 100644
--- a/tests/test_cases.cc
+++ b/tests/test_cases.cc
@@ -473,6 +473,7 @@ using namespace clanguml::test::matchers;
 #include "t20044/test_case.h"
 #include "t20045/test_case.h"
 #include "t20046/test_case.h"
+#include "t20047/test_case.h"
 
 ///
 /// Package diagram tests
diff --git a/tests/test_cases.yaml b/tests/test_cases.yaml
index a2675040..a9f7954e 100644
--- a/tests/test_cases.yaml
+++ b/tests/test_cases.yaml
@@ -361,6 +361,9 @@ test_cases:
     - name: t20046
       title: Test case for call expressions in nested lambdas
       description:
+    - name: t20047
+      title: Test case for 'call' comment directive
+      description:
   Package diagrams:
     - name: t30001
       title: Basic package diagram test case