1 files changed, 1 insertions, 0 deletions

diff --git a/obs.ipkg b/obs.ipkg
index 45ebe9a..14e9f93 100644
--- a/obs.ipkg
+++ b/obs.ipkg
@@ -11,5 +11,6 @@ modules
   , Core.Name
   , Core.Term
   , Core.Term.Environment
+  , Core.Term.Substitution
   , Core.Thinning
   , Core.Var