diff --git a/build-constraints.yaml b/build-constraints.yaml
index 7e6b1edd..7059e235 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5352,7 +5352,7 @@ packages:
         - nvim-hs-contrib < 0 # 2.0.0.0
         - odbc < 0 # odbc
         - open-witness < 0 # 0.5
-        - pencil < 0
+        - pencil < 0 # 1.0.1
         - pipes-aeson < 0 # 0.4.1.8
         - pipes-binary < 0 # 0.4.3
         - pipes-network < 0 # 0.6.5