diff --git a/workbench/invalid-hashes.json b/workbench/invalid-hashes.json
index 50e5f9e..8b9ed78 100644
--- a/workbench/invalid-hashes.json
+++ b/workbench/invalid-hashes.json
@@ -35,6 +35,7 @@
   "librarycarpentry/lc-shell" : "37796ecdd2e321deb8b153b7fcd7bc073668bea4",
   "librarycarpentry/lc-sql" : "37796ecdd2e321deb8b153b7fcd7bc073668bea4",
   "librarycarpentry/lc-r" : "e83e2c9bdeb259fcb7b12ae21da8f6eac8ff34a4",
+  "librarycarpentry/lc-overview" : "e83e2c9bdeb259fcb7b12ae21da8f6eac8ff34a4",
   "librarycarpentry/lc-spreadsheets" : "e83e2c9bdeb259fcb7b12ae21da8f6eac8ff34a4",
   "librarycarpentry/lc-python-intro" : "b4fbb1fcd0f6850d57dfb6f0a136bc255ac1e900",
   "swcarpentry/git-novice-es" : "b4fbb1fcd0f6850d57dfb6f0a136bc255ac1e900",