diff --git a/.changeset/chilled-flies-speak.md b/.changeset/chilled-flies-speak.md
new file mode 100644
index 0000000000..fc647a4fd5
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+++ b/.changeset/chilled-flies-speak.md
@@ -0,0 +1,5 @@
+---
+'@backstage/core-api': patch
+---
+
+Changed the signature of `createRoutableExtension` to include null