diff --git a/changelogs/fragments/1738-export_chunk_size.yml b/changelogs/fragments/1738-export_chunk_size.yml
new file mode 100644
index 0000000000..89b6b97b83
--- /dev/null
+++ b/changelogs/fragments/1738-export_chunk_size.yml
@@ -0,0 +1,2 @@
+minor_changes:
+  - content_export_* - document that ``chunk_size_gb`` parameter is only applicable for ``importable`` exports (https://github.com/theforeman/foreman-ansible-modules/issues/1738)
diff --git a/plugins/doc_fragments/foreman.py b/plugins/doc_fragments/foreman.py
index 0f33b3d1cf..4afd3b73d8 100644
--- a/plugins/doc_fragments/foreman.py
+++ b/plugins/doc_fragments/foreman.py
@@ -392,6 +392,7 @@ class ModuleDocFragment(object):
   chunk_size_gb:
     description:
       - Split the exported content into archives no greater than the specified size in gigabytes.
+      - Only applicable for C(format=importable). C(syncable) exports can't be split.
     required: false
     type: int
   format:
diff --git a/plugins/module_utils/foreman_helper.py b/plugins/module_utils/foreman_helper.py
index e6f6459631..30d4f017e2 100644
--- a/plugins/module_utils/foreman_helper.py
+++ b/plugins/module_utils/foreman_helper.py
@@ -1585,6 +1585,9 @@ def run(self, **kwargs):
         if self.params.get('from_history_id') and incremental is not True:
             self.fail_json(msg='from_history_id is only valid for incremental exports')
 
+        if 'chunk_size_gb' in self.foreman_params and self.foreman_params['format'] == 'syncable':
+            self.fail_json(msg='chunk_size_gb is only valid for importable exports')
+
         self.auto_lookup_entities()
 
         payload = _flatten_entity(self.foreman_params, self.foreman_spec)