diff --git a/docs/install/custom-server.rst b/docs/install/custom-server.rst
index 96d2be3..8ea1008 100644
--- a/docs/install/custom-server.rst
+++ b/docs/install/custom-server.rst
@@ -44,7 +44,7 @@ Step 1: Installing The Littlest JupyterHub
    .. code::
 
       export REQUESTS_CA_BUNDLE=</directory/with/your/ssl/certificates>
-      sudo npm config set cafile </directory/with/your/ssl/certificates>
+      sudo npm config set cafile=</directory/with/your/ssl/certificates>
 
 #. Make sure you have ``Python3``, ``curl`` and ``git``  installed. On latest Ubuntu you can get all of these with: