diff --git a/app/Util/Lexer/RestrictedNames.php b/app/Util/Lexer/RestrictedNames.php
index 44c431332..c7f36e0b2 100644
--- a/app/Util/Lexer/RestrictedNames.php
+++ b/app/Util/Lexer/RestrictedNames.php
@@ -24,6 +24,8 @@ class RestrictedNames {
      "dev",
      "developer",
      "developers",
+     "discover",
+     "discovers",
      "doc",
      "docs",
      "download",
@@ -42,6 +44,7 @@ class RestrictedNames {
      "guest",
      "guests",
      "help",
+     "horizon",
      "hostmaster",
      "hostmaster",
      "i",