diff --git a/README.md b/README.md
index 42678e6..aa8a31e 100644
--- a/README.md
+++ b/README.md
@@ -224,6 +224,21 @@ class-level properties or configurations, put it in your `frankframework`
 checkout and not in your Frank!Runner checkout. Use folder
 `frankframework/webapp/src/main/resources`.
 
+There is an additional consideration when running `specials/ladybug` with
+`test.with.iaf=true`. Doing this requires that the `pom.xml` files in the
+frankframework and ladybug checkouts are aligned. The ladybug version
+referenced in `frankframework/ladybug/pom.xml` must be the version of the
+ladybug checkout. If you want to build with the latest ladybug-frontend code,
+you also have to do the Maven build of ladybug-frontend, and the ladybug
+frontend version referenced in `ladybug/pom.xml` must match the version
+defined in `ladybug-frontend/pom.xml`.
+
+In `frank-runner/specials/util/syncPomVersions`, there is an ANT script to
+adjust the mentioned `pom.xml` files to be aligned. To use it, change
+directory to `frank-runner/specials/util/syncPomVersions` and execute:
+
+    ../../../build/apache-ant-1.10.10/bin/ant bump-ladybug-in-ff
+
 # Project structure and customisation
 
 In case Frank2YourApplication contains a pom.xml it is assumed to be a Maven
diff --git a/specials/util/syncPomVersions/build.xml b/specials/util/syncPomVersions/build.xml
new file mode 100644
index 0000000..685ae8d
--- /dev/null
+++ b/specials/util/syncPomVersions/build.xml
@@ -0,0 +1,23 @@
+<project name="syncPomVersions"
+    basedir="../../../..">
+    <target name="bump-ladybug-in-ff" depends="ladybug-backend-takes-frontend,ff-takes-ladybug-backend" />
+    <!-- It was tried to do this with xmltask. That had two drawbacks: 
+         1. It changes something with surrounding spaces and tabs, causing every line to be changed according to git diff.
+         2. This requires the xmltask.jar task to be present, and we have to take care of its license
+         These drawbacks explain why xmltask is not used here.
+    -->
+    <target name="ladybug-backend-takes-frontend">
+        <xmlproperty file="ladybug-frontend/pom.xml" prefix="ladybug.frontend" />
+        <xmlproperty file="ladybug/pom.xml" prefix="ladybug.backend" />
+        <replace file="ladybug/pom.xml"
+            token="&lt;frontend.version&gt;${ladybug.backend.project.properties.frontend.version}&lt;/frontend.version&gt;"
+            value="&lt;frontend.version&gt;${ladybug.frontend.project.properties.revision}&lt;/frontend.version&gt;" />
+    </target>
+    <target name="ff-takes-ladybug-backend">
+        <xmlproperty file="ladybug/pom.xml" prefix="ladybug.backend" />
+        <xmlproperty file="frankframework/ladybug/pom.xml" prefix="ff.ladybug" />
+        <replace file="frankframework/ladybug/pom.xml"
+            token="&lt;ladybug.version&gt;${ff.ladybug.project.properties.ladybug.version}&lt;/ladybug.version&gt;"
+            value="&lt;ladybug.version&gt;${ladybug.backend.project.properties.revision}&lt;/ladybug.version&gt;" />
+    </target>
+</project>
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