diff --git a/lib/ansible/plugins/doc_fragments/inventory_cache.py b/lib/ansible/plugins/doc_fragments/inventory_cache.py
index 4d64fda18c9..9326c3f566a 100644
--- a/lib/ansible/plugins/doc_fragments/inventory_cache.py
+++ b/lib/ansible/plugins/doc_fragments/inventory_cache.py
@@ -71,6 +71,7 @@ options:
         key: fact_caching_prefix
         deprecated:
           alternatives: Use the 'defaults' section instead
+          why: Fixes typing error in INI section name
           version: '2.16'
       - section: defaults
         key: fact_caching_prefix