Minor documentation update

Author: keaven

R/gsDesign.R

@@ -286,9 +286,11 @@ gsBound1 <- function(theta, I, a, probhi, tol = 0.000001, r = 18, printerr = 0)
 #' O'Brien-Fleming-like conservative bound when used with the default
 #' Hwang-Shih-DeCani spending function. This is a real-vector for many spending
 #' functions.  The parameter \code{sfupar} specifies any parameters needed for
-#' the spending function specified by \code{sfu}; this will be ignored for
+#' the spending function specified by \code{sfu}; this is not needed for
 #' spending functions (\code{sfLDOF}, \code{sfLDPocock}) or bound types
 #' (\dQuote{OF}, \dQuote{Pocock}) that do not require parameters.
+#' Note that \code{sfupar} can be specified as a positive scalar for
+#' \code{sfLDOF} for a generalized O'Brien-Fleming spending function.
 #' @param sfl Specifies the spending function for lower boundary crossing
 #' probabilities when asymmetric, two-sided testing is performed
 #' (\code{test.type = 3}, \code{4}, \code{5}, or \code{6}).  Unlike the upper