diff --git a/pkgs/build-support/references-by-popularity/closure-graph.py b/pkgs/build-support/references-by-popularity/closure-graph.py
index 579f3b041fa8..4f8efd42ed81 100644
--- a/pkgs/build-support/references-by-popularity/closure-graph.py
+++ b/pkgs/build-support/references-by-popularity/closure-graph.py
@@ -8,8 +8,8 @@
 # and how deep in the tree they live. Equally-"popular" paths are then
 # sorted by name.
 #
-# The existing writeReferencesToFile prints the paths in a simple
-# ascii-based sorting of the paths.
+# The existing writeClosure prints the paths in a simple ascii-based
+# sorting of the paths.
 #
 # Sorting the paths by graph improves the chances that the difference
 # between two builds appear near the end of the list, instead of near