diff --git a/slides/exercises/ingress-details.md b/slides/exercises/ingress-details.md
index 4c0e7582..bdbefb95 100644
--- a/slides/exercises/ingress-details.md
+++ b/slides/exercises/ingress-details.md
@@ -16,7 +16,7 @@
 
 ## Goal
 
-- We want to be able to access the web app using an URL like:
+- We want to be able to access the web app using a URL like:
 
   http://webapp.localdev.me