diff --git a/Framework/Algorithms/inc/MantidAlgorithms/BinaryOperation.h b/Framework/Algorithms/inc/MantidAlgorithms/BinaryOperation.h
index fe4d6c450c666033dbfb87803af2ce90931b9778..16b3392f45c303a2504dcb688b80f617cb5be066 100644
--- a/Framework/Algorithms/inc/MantidAlgorithms/BinaryOperation.h
+++ b/Framework/Algorithms/inc/MantidAlgorithms/BinaryOperation.h
@@ -117,7 +117,8 @@ protected:
    *number.
    *
    *  @param lhs :: Lhs histogram data
-   *  @param rhs :: Rhs histogram data
+   *  @param rhsY :: The rhs data value
+   *  @param rhsE :: The lhs data value
    *  @param YOut :: Data values resulting from the operation
    *  @param EOut :: Error values resulting from the operation
    */