diff --git a/doc/data/messages/c/comparison-with-itself/bad.py b/doc/data/messages/c/comparison-with-itself/bad.py
new file mode 100644
index 0000000000..77794bc5c9
--- /dev/null
+++ b/doc/data/messages/c/comparison-with-itself/bad.py
@@ -0,0 +1,3 @@
+def is_an_orange(fruit):
+    an_orange = "orange"
+    return fruit == fruit  # [comparison-with-itself]
diff --git a/doc/data/messages/c/comparison-with-itself/good.py b/doc/data/messages/c/comparison-with-itself/good.py
new file mode 100644
index 0000000000..b2b4296502
--- /dev/null
+++ b/doc/data/messages/c/comparison-with-itself/good.py
@@ -0,0 +1,3 @@
+def is_an_orange(fruit):
+    an_orange = "orange"
+    return an_orange == fruit