diff --git a/docs/pages/api/linear-progress.md b/docs/pages/api/linear-progress.md
index ea1408506f0d14..a45999a6133292 100644
--- a/docs/pages/api/linear-progress.md
+++ b/docs/pages/api/linear-progress.md
@@ -46,7 +46,7 @@ Any other props supplied will be provided to the root element (native element).
 | Rule name | Global class | Description |
 |:-----|:-------------|:------------|
 | <span class="prop-name">root</span> | <span class="prop-name">.MuiLinearProgress-root</span> | Styles applied to the root element.
-| <span class="prop-name">colorPrimary</span> | <span class="prop-name">.MuiLinearProgress-colorPrimary</span> | Styles applied to the root and bar2 element if `color="primary"`; bar2 if `variant-"buffer"`.
+| <span class="prop-name">colorPrimary</span> | <span class="prop-name">.MuiLinearProgress-colorPrimary</span> | Styles applied to the root and bar2 element if `color="primary"`; bar2 if `variant="buffer"`.
 | <span class="prop-name">colorSecondary</span> | <span class="prop-name">.MuiLinearProgress-colorSecondary</span> | Styles applied to the root and bar2 elements if `color="secondary"`; bar2 if `variant="buffer"`.
 | <span class="prop-name">determinate</span> | <span class="prop-name">.MuiLinearProgress-determinate</span> | Styles applied to the root element if `variant="determinate"`.
 | <span class="prop-name">indeterminate</span> | <span class="prop-name">.MuiLinearProgress-indeterminate</span> | Styles applied to the root element if `variant="indeterminate"`.
diff --git a/packages/material-ui/src/LinearProgress/LinearProgress.js b/packages/material-ui/src/LinearProgress/LinearProgress.js
index e45ddd6d6eb7b9..5e7e3711b3ad6a 100644
--- a/packages/material-ui/src/LinearProgress/LinearProgress.js
+++ b/packages/material-ui/src/LinearProgress/LinearProgress.js
@@ -22,7 +22,7 @@ export const styles = theme => {
       overflow: 'hidden',
       height: 4,
     },
-    /* Styles applied to the root and bar2 element if `color="primary"`; bar2 if `variant-"buffer"`. */
+    /* Styles applied to the root and bar2 element if `color="primary"`; bar2 if `variant="buffer"`. */
     colorPrimary: {
       backgroundColor: backgroundPrimary,
     },