diff --git a/hapi-fhir-docs/src/main/resources/ca/uhn/hapi/fhir/changelog/5_1_0/1878-avoid-duplicate-classes.yaml b/hapi-fhir-docs/src/main/resources/ca/uhn/hapi/fhir/changelog/5_1_0/1878-avoid-duplicate-classes.yaml
new file mode 100644
index 00000000000..a927ebf3140
--- /dev/null
+++ b/hapi-fhir-docs/src/main/resources/ca/uhn/hapi/fhir/changelog/5_1_0/1878-avoid-duplicate-classes.yaml
@@ -0,0 +1,5 @@
+---
+type: fix
+issue: 1878
+title: "Several duplicate classes were removed from the testpage overlay, avoiding a warning on startup. Thanks to
+  Joel Schneider for the pull request!"