diff --git a/docs/src/pages/customization/palette/palette.md b/docs/src/pages/customization/palette/palette.md
index 806d608c966f4d..32f224ca887fdf 100644
--- a/docs/src/pages/customization/palette/palette.md
+++ b/docs/src/pages/customization/palette/palette.md
@@ -84,7 +84,7 @@ const theme = createMuiTheme({
     },
     // Used by `getContrastText()` to maximize the contrast between
     // the background and the text.
-    contrastThreshold = 3,
+    contrastThreshold: 3,
     // Used by the functions below to shift a color's luminance by approximately
     // two indexes within its tonal palette.
     // E.g., shift from Red 500 to Red 300 or Red 700.