diff --git a/docs/sources/concepts/introduction.rst b/docs/sources/concepts/introduction.rst
index fcdd37a791..7251b51786 100644
--- a/docs/sources/concepts/introduction.rst
+++ b/docs/sources/concepts/introduction.rst
@@ -5,8 +5,8 @@
 Introduction
 ============
 
-Docker - The Linux container runtime
-------------------------------------
+Docker -- The Linux container runtime
+-------------------------------------
 
 Docker complements LXC with a high-level API which operates at the process level. It runs unix processes with strong guarantees of isolation and repeatability across servers.
 
diff --git a/docs/sources/index.rst b/docs/sources/index.rst
index 172f82083c..3e66fde1fb 100644
--- a/docs/sources/index.rst
+++ b/docs/sources/index.rst
@@ -7,8 +7,8 @@
 Introduction
 ============
 
-Docker - The Linux container runtime
-------------------------------------
+Docker -- The Linux container runtime
+-------------------------------------
 
 Docker complements LXC with a high-level API which operates at the process level. It runs unix processes with strong guarantees of isolation and repeatability across servers.