diff --git a/R/ggroc.R b/R/ggroc.R
index 3f12951..9ce945c 100644
--- a/R/ggroc.R
+++ b/R/ggroc.R
@@ -5,28 +5,34 @@ get.coords.for.ggplot <- function(roc) {
 	return(df[rev(seq(nrow(df))),])
 }
 
-get.aes.for.ggplot <- function(roc, legacy.axes) {
+get.aes.for.ggplot <- function(roc, legacy.axes, extra_aes) {
 	# Prepare the aesthetics
 	if(roc$percent) {
 		if (legacy.axes) {
-			aes <- ggplot2::aes_string(x = "1-specificity", y = "sensitivity")
+			aes_list <- list(x = "1-specificity", y = "sensitivity")
 			xlims <- ggplot2::scale_x_continuous(lim=c(0, 100))		
 		}
 		else {
-			aes <- ggplot2::aes_string(x = "specificity", y = "sensitivity")
+			aes_list <- list(x = "specificity", y = "sensitivity")
 			xlims <- ggplot2::scale_x_reverse(lim=c(100, 0))
 		}
 	}
 	else {
 		if (legacy.axes) {
-			aes <- ggplot2::aes_string(x = "1-specificity", y = "sensitivity")
+			aes_list <- list(x = "1-specificity", y = "sensitivity")
 			xlims <- ggplot2::scale_x_continuous(lim=c(0, 1))
 		}
 		else {
-			aes <- ggplot2::aes_string(x = "specificity", y = "sensitivity")
+			aes_list <- list(x = "specificity", y = "sensitivity")
 			xlims <- ggplot2::scale_x_reverse(lim=c(1, 0))
 		}
 	}
+	# Add extra aes
+	for (ae in extra_aes) {
+		aes_list[[ae]] <- "name"
+	}
+	aes <- do.call(ggplot2::aes_string, aes_list)
+	
 	return(list(aes=aes, xlims=xlims))
 }
 
@@ -49,8 +55,12 @@ ggroc.roc <- function(data, legacy.axes = FALSE, ...) {
 }
 
 ggroc.list <- function(data, aes = c("colour", "alpha", "linetype", "size", "group"), legacy.axes = FALSE, ...) {
-	aes <- match.arg(aes)
-	
+	if (missing(aes)) {
+		aes <- "colour"
+	}
+	aes <- sub("color", "colour", aes)
+	aes <- match.arg(aes, several.ok = TRUE)
+
 	# Make sure data is a list and every element is a roc object
 	if (! all(sapply(data, is, "roc"))) {
 		stop("All elements in 'data' must be 'roc' objects.")
@@ -83,8 +93,7 @@ ggroc.list <- function(data, aes = c("colour", "alpha", "linetype", "size", "gro
 	coord.dfs <- do.call(rbind, coord.dfs)
 	
 	# Prepare the aesthetics
-	aes.ggplot <- get.aes.for.ggplot(data[[1]], legacy.axes)
-	aes.ggplot$aes[[aes]] <- as.symbol("name")
+	aes.ggplot <- get.aes.for.ggplot(data[[1]], legacy.axes, aes)
 
 	# Do the plotting
 	ggplot(coord.dfs, aes.ggplot$aes) + ggplot2::geom_line(...) + aes.ggplot$xlims
diff --git a/man/ggroc.Rd b/man/ggroc.Rd
index baaaba1..d62d19d 100644
--- a/man/ggroc.Rd
+++ b/man/ggroc.Rd
@@ -19,7 +19,7 @@
 \arguments{
   \item{data}{a roc object from the \link{roc} function, or a list of roc objects.
   }
-  \item{aes}{the name of the aesthetics for \code{\link{geom_line}} to map to the different ROC curves supplied. Use \dQuote{group} if
+  \item{aes}{the name(s) of the aesthetics for \code{\link{geom_line}} to map to the different ROC curves supplied. Use \dQuote{group} if
   you want the curves to appear with the same aestetic, for instance if you are faceting instead.}
   \item{legacy.axes}{a logical indicating if the specificity axis (x
     axis) must be plotted as as decreasing \dQuote{specificity}
@@ -74,6 +74,9 @@ g3 <- ggroc(roc.list, linetype=2)
 g3
 g4 <- ggroc(roc.list, aes="linetype", color="red")
 g4
+# changing multiple aesthetics:
+g5 <- ggroc(roc.list, aes=c("linetype", "color"))
+g5
 
 # OR faceting
 g.list + facet_grid(.~name) + theme(legend.position="none")