diff --git a/doc/fluid/index_en.rst b/doc/fluid/index_en.rst
index 2bc76b58982cf50e637d15cca0c5d78166aa73a9..1b6f5fa580e173a2829d5ad20525d686ec284921 100644
--- a/doc/fluid/index_en.rst
+++ b/doc/fluid/index_en.rst
@@ -10,3 +10,4 @@
   howto/index_en.rst
   dev/index_en.rst
   faq/index_en.rst
+  api/index_en.rst