diff --git a/man/CreateErrorCrit_GAPX.Rd b/man/CreateErrorCrit_GAPX.Rd
index 487e42f540c040e75f02991b2df525c0f336d698..ab8ed228288d9d308e815d681f80535eb6950112 100644
--- a/man/CreateErrorCrit_GAPX.Rd
+++ b/man/CreateErrorCrit_GAPX.Rd
@@ -31,7 +31,7 @@ CreateErrorCrit_GAPX(FUN_TRANSFO)
 
 \details{
 In addition to the criterion value, the function outputs include a multiplier (-1 or +1) that allows
-the use of the function for model calibration: the product \code{CritValue * Multiplier} is the criterion to be minimised
+the use of the function for model calibration: the product \eqn{CritValue \times Multiplier} is the criterion to be minimised
 (\code{Multiplier = -1} for NSE).
 }