diff --git a/conservancy_beancount/plugin/meta_payable_documentation.py b/conservancy_beancount/plugin/meta_payable_documentation.py
index 8f77611066f1f316804445186f619b4fbf122988..fd37651a66bfd23514d6811a05fa44f7fa68d3ef 100644
--- a/conservancy_beancount/plugin/meta_payable_documentation.py
+++ b/conservancy_beancount/plugin/meta_payable_documentation.py
@@ -27,6 +27,6 @@ class MetaPayableDocumentation(core._RequireLinksPostingMetadataHook):
 
     def _run_on_post(self, txn: Transaction, post: data.Posting) -> bool:
         if post.account.is_under('Liabilities:Payable:Accounts'):
-            return not post.is_credit()
+            return post.units.number < 0
         else:
             return False