diff --git a/doc/differentiation/autodiff_reverse.qbk b/doc/differentiation/autodiff_reverse.qbk
index 505fd7d5a..ab032dd4c 100644
--- a/doc/differentiation/autodiff_reverse.qbk
+++ b/doc/differentiation/autodiff_reverse.qbk
@@ -26,7 +26,7 @@
       // default
       rvar();
       // construct from numeric type
-      rar(const RealType value);
+      rvar(const RealType value);
       // copy
       rvar(const rvar<RealType, DerivativeOrder> other);