Update _config.yml

_config.yml

@@ -22,7 +22,7 @@ source-code: https://github.com/CollectionBuilder/collectionbuilder-gh
 # title of site appears in banner
 title: Humanizing Howard
 # tagline, a short phrase that will appear throughout the site in the top banner
-tagline: Exploring a microcosm of the humans who studied, visited, spoke and generally contributed their energy to build Howard University's legacy over the last 157 years.
+tagline: Exploring a microcosm of the humans who studied, visited, spoke at and generally contributed their energy to build Howard University's legacy over the last 157 years.
 # description appears in meta tags and other locations
 # this description might appear in search result lists, keep around 160 characters max
 description: "This informal exhibit is comprised of materials generously borrowed from Howard University's Digital Collections."