diff --git a/docs/test_cases.md b/docs/test_cases.md
index 2b7786c1..a02ab059 100644
--- a/docs/test_cases.md
+++ b/docs/test_cases.md
@@ -34,6 +34,7 @@
  * [t00033](./test_cases/t00033.md) - Nested template instantiation dependency test case
  * [t00034](./test_cases/t00034.md) - Template metaprogramming type function test case
 ## Sequence diagrams
- * [t20001](./test_cases/t20001.md) - Basic sequence diagram
+ * [t20001](./test_cases/t20001.md) - Basic sequence diagram test case
+ * [t20002](./test_cases/t20002.md) - Free function sequence diagram test case
 ## Configuration diagrams
  * [t90000](./test_cases/t90000.md) - Basic config test
diff --git a/docs/test_cases/t20001.md b/docs/test_cases/t20001.md
index dfcfd490..2fc889bd 100644
--- a/docs/test_cases/t20001.md
+++ b/docs/test_cases/t20001.md
@@ -1,4 +1,4 @@
-# t20001 - Basic sequence diagram
+# t20001 - Basic sequence diagram test case
 ## Config
 ```yaml
 compilation_database_dir: ..
@@ -101,4 +101,4 @@ int tmain()
 
 ```
 ## Generated UML diagrams
-![t20001_sequence](./t20001_sequence.png "Basic sequence diagram")
+![t20001_sequence](./t20001_sequence.png "Basic sequence diagram test case")
diff --git a/docs/test_cases/t20001_sequence.png b/docs/test_cases/t20001_sequence.png
index 7dd16d2e..e972c3f5 100644
Binary files a/docs/test_cases/t20001_sequence.png and b/docs/test_cases/t20001_sequence.png differ
diff --git a/docs/test_cases/t20002.md b/docs/test_cases/t20002.md
new file mode 100644
index 00000000..6dcda520
--- /dev/null
+++ b/docs/test_cases/t20002.md
@@ -0,0 +1,42 @@
+# t20002 - Free function sequence diagram test case
+## Config
+```yaml
+compilation_database_dir: ..
+output_directory: puml
+diagrams:
+  t20002_sequence:
+    type: sequence
+    glob:
+      - ../../tests/t20002/t20002.cc
+    include:
+      namespaces:
+        - clanguml::t20002
+    using_namespace:
+      - clanguml::t20002
+    start_from:
+      - function: "clanguml::t20002::m1()"
+
+```
+## Source code
+File t20002.cc
+```cpp
+#include <algorithm>
+#include <numeric>
+#include <vector>
+
+namespace clanguml {
+namespace t20002 {
+
+void m4() { }
+
+void m3() { m4(); }
+
+void m2() { m3(); }
+
+void m1() { m2(); }
+}
+}
+
+```
+## Generated UML diagrams
+![t20002_sequence](./t20002_sequence.png "Free function sequence diagram test case")
diff --git a/docs/test_cases/t20002_sequence.png b/docs/test_cases/t20002_sequence.png
new file mode 100644
index 00000000..74f0e2cb
Binary files /dev/null and b/docs/test_cases/t20002_sequence.png differ