diff --git a/pyproject.toml b/pyproject.toml
index 5943897..0521bb2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,10 +8,11 @@ env_name = "engine"
 
 [tool.pkgmt.check_links]
 extensions = ["md", "rst", "py", "ipynb"]
+ignore_substrings = ["platform.ploomber.io"]
 
 
 [tool.nbqa.addopts]
 flake8 = [
     # notebooks allow non-top imports
     "--extend-ignore=E402",
-]
\ No newline at end of file
+]