diff --git a/src/rt/shell/color.ts b/src/rt/shell/color.ts
index a186897..1c3fe2b 100644
--- a/src/rt/shell/color.ts
+++ b/src/rt/shell/color.ts
@@ -7,20 +7,23 @@ const enum Colors {
 	cyan  = "cyan",
 	bold  = "bold"
 }
-function newcolor(inner: string, color?: Colors) {
+function newcolor(inner: string, color?: Colors, bold?: boolean) {
 	const span = create("span", color)
 	span.innerText = inner
+	if (bold) {
+		span.className = color ? color+" bold" : "bold"
+	}
 	return span
 }
 
-const red   = (s: string) => newcolor(s, Colors.red )
-const green = (s: string) => newcolor(s, Colors.green)
-const blue  = (s: string) => newcolor(s, Colors.blue)
-const cyan  = (s: string) => newcolor(s, Colors.cyan)
-const bold  = (s: string) => newcolor(s, Colors.bold)
+const red   = (s: string, bold?: boolean) => newcolor(s, Colors.red,   bold)
+const green = (s: string, bold?: boolean) => newcolor(s, Colors.green, bold)
+const blue  = (s: string, bold?: boolean) => newcolor(s, Colors.blue,  bold)
+const cyan  = (s: string, bold?: boolean) => newcolor(s, Colors.cyan,  bold)
+const bold  = (s: string)                 => newcolor(s, Colors.bold)
 
-export default function rgb(s: string, Ru8: number, Gu8: number, Bu8: number) {
-	const rgb_span = newcolor(s)
+export default function rgb(s: string, Ru8: number, Gu8: number, Bu8: number, bold?: boolean) {
+	const rgb_span = newcolor(s, undefined, bold)
 	rgb_span.style.color = `rgb(${Ru8},${Gu8},${Bu8})`
 	return rgb_span
 }