diff --git a/test/overlay-multiline-description/input.yaml b/test/overlay-multiline-description/input.yaml
new file mode 100644
index 0000000..3b6bb0d
--- /dev/null
+++ b/test/overlay-multiline-description/input.yaml
@@ -0,0 +1,12 @@
+openapi: 3.0.0
+info:
+  title: Test API
+  version: 1.0.0
+  description: Original description
+paths:
+  /test:
+    get:
+      description: Old path description
+      responses:
+        '200':
+          description: OK
diff --git a/test/overlay-multiline-description/options.yaml b/test/overlay-multiline-description/options.yaml
new file mode 100644
index 0000000..d3d7560
--- /dev/null
+++ b/test/overlay-multiline-description/options.yaml
@@ -0,0 +1,3 @@
+overlayFile: overlay.yaml
+output: output.yaml
+no-sort: true
diff --git a/test/overlay-multiline-description/output.yaml b/test/overlay-multiline-description/output.yaml
new file mode 100644
index 0000000..e79e1e3
--- /dev/null
+++ b/test/overlay-multiline-description/output.yaml
@@ -0,0 +1,18 @@
+openapi: 3.0.0
+info:
+  title: Test API
+  version: 1.0.0
+  description: |-
+    First line of markdown content.
+
+    Second line of markdown content.
+paths:
+  /test:
+    get:
+      description: |-
+        Path description line 1.
+
+        Path description line 2.
+      responses:
+        '200':
+          description: OK
diff --git a/test/overlay-multiline-description/overlay.yaml b/test/overlay-multiline-description/overlay.yaml
new file mode 100644
index 0000000..91a64cf
--- /dev/null
+++ b/test/overlay-multiline-description/overlay.yaml
@@ -0,0 +1,13 @@
+actions:
+  - target: $.info
+    update:
+      description: |-
+        First line of markdown content.
+
+        Second line of markdown content.
+  - target: $.paths['/test'].get
+    update:
+      description: |-
+        Path description line 1.
+
+        Path description line 2.