diff --git a/index.d.ts b/index.d.ts
index 23c3d40..c50c17e 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -214,7 +214,7 @@ declare namespace chalk {
 		hwb(hue: number, whiteness: number, blackness: number): Chalk;
 
 		/**
-		Use 8-bit unsigned number to set text color.
+		Use a [8-bit unsigned number](https://en.wikipedia.org/wiki/ANSI_escape_code#8-bit) to set text color.
 		*/
 		ansi256(index: number): Chalk;
 
@@ -267,7 +267,7 @@ declare namespace chalk {
 		bgHwb(hue: number, whiteness: number, blackness: number): Chalk;
 
 		/**
-		Use 8-bit unsigned number to set background color.
+		Use a [8-bit unsigned number](https://en.wikipedia.org/wiki/ANSI_escape_code#8-bit) to set background color.
 		*/
 		bgAnsi256(index: number): Chalk;