diff --git a/.changeset/new-colts-sip.md b/.changeset/new-colts-sip.md
new file mode 100644
index 0000000000..1ed8d432f9
--- /dev/null
+++ b/.changeset/new-colts-sip.md
@@ -0,0 +1,7 @@
+---
+"@khanacademy/math-input": minor
+"@khanacademy/perseus": minor
+---
+
+Make the Expression widget treat `sen` as equivalent to `sin`. The spelling
+`sen` is used in Portuguese.