diff --git a/packages/geometry-fns/package.json b/packages/geometry-fns/package.json
index 9f3dc84..f2475b0 100644
--- a/packages/geometry-fns/package.json
+++ b/packages/geometry-fns/package.json
@@ -12,6 +12,7 @@
     }
   },
   "files": ["CHANGELOG.md", "dist", "LICENSE", "logo.png", "README.md"],
+  "main": "./dist/index.js",
   "name": "@haydn/geometry-fns",
   "private": false,
   "repository": {
diff --git a/packages/grid-fns/package.json b/packages/grid-fns/package.json
index 30cde36..e06ed51 100644
--- a/packages/grid-fns/package.json
+++ b/packages/grid-fns/package.json
@@ -12,6 +12,7 @@
     }
   },
   "files": ["CHANGELOG.md", "dist", "LICENSE", "logo.png", "README.md"],
+  "main": "./dist/index.js",
   "name": "@haydn/grid-fns",
   "private": false,
   "repository": {
diff --git a/packages/linear-fns/package.json b/packages/linear-fns/package.json
index a491769..d44c824 100644
--- a/packages/linear-fns/package.json
+++ b/packages/linear-fns/package.json
@@ -9,6 +9,7 @@
     }
   },
   "files": ["CHANGELOG.md", "dist", "LICENSE", "logo.png", "README.md"],
+  "main": "./dist/index.js",
   "name": "@haydn/linear-fns",
   "private": false,
   "repository": {