diff --git a/CLAUDE.md b/CLAUDE.md
index ccb33a6..1ebccee 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -4,4 +4,3 @@ A tiny, dependency-free Node library used as Radial's throwaway build target.
 
 - Tests run with `npm test` (`node --test`). No install step — there are no deps.
 - Keep functions pure and exported from `src/`.
-- One test is currently failing on purpose, so a build turn has something real to fix.
diff --git a/src/calc.js b/src/calc.js
index 5f5f81a..c4b4a20 100644
--- a/src/calc.js
+++ b/src/calc.js
@@ -1,10 +1,9 @@
-// A tiny pure-function library. `multiply` is intentionally left unimplemented
-// so the build target ships with one failing test for a build turn to fix.
+// A tiny pure-function library.
 
 export function add(a, b) {
 	return a + b;
 }
 
 export function multiply(a, b) {
-	throw new Error('multiply not implemented');
+	return a * b;
 }