diff --git a/doc/install/installation.md b/doc/install/installation.md
index dd696f954aa8d20dfd601f790c2a09511304f4f7..8ab6ad689810c380856944e7adc87f727f4acf57 100644
--- a/doc/install/installation.md
+++ b/doc/install/installation.md
@@ -111,7 +111,7 @@ Create a `git` user for Gitlab:
 
 # 4. GitLab shell
 
-GitLab Shell is a ssh access and repository management software developed specially for GitLab.
+GitLab Shell is an ssh access and repository management software developed specially for GitLab.
 
     # Go to home directory
     cd /home/git