diff --git a/doc/source/installation-guide.rst b/doc/source/installation-guide.rst
index 1927a32d..20826cbd 100644
--- a/doc/source/installation-guide.rst
+++ b/doc/source/installation-guide.rst
@@ -1,7 +1,7 @@
-iInstallation Guide
---------------------------
+Installation Guide
+------------------
 Now the Tricircle can be played with Devstack for all-in-one single pod and
-multi-pod. You can build different Tricircle environment with Devstack
+multi-pod. You can build different Tricircle environments with Devstack
 according to your needs. In the near future there will be a manual installation
 guide in this installation guide that discussing how to install the Tricircle
 step by step without DevStack for users who install OpenStack manually.