diff --git a/doc/fluid/api/api_guides/index.rst b/doc/fluid/api/api_guides/index.rst
index a31fbc0d36351921c4110005c83430f6c9176527..89f31759ddbe082b6128b75c02013a4f8c51229f 100644
--- a/doc/fluid/api/api_guides/index.rst
+++ b/doc/fluid/api/api_guides/index.rst
@@ -1,5 +1,5 @@
 ===========
-API Guides
+API Guide
 ===========
 
 ..  toctree::