diff --git a/docs/pages/api/filled-input.md b/docs/pages/api/filled-input.md
index 9744fcbaba5a44..63bbf2f4f7c348 100644
--- a/docs/pages/api/filled-input.md
+++ b/docs/pages/api/filled-input.md
@@ -70,7 +70,7 @@ Any other props supplied will be provided to the root element ([InputBase](/api/
 | <span class="prop-name">disabled</span> | <span class="prop-name">.Mui-disabled</span> | Pseudo-class applied to the root element if `disabled={true}`.
 | <span class="prop-name">adornedStart</span> | <span class="prop-name">.MuiFilledInput-adornedStart</span> | Styles applied to the root element if `startAdornment` is provided.
 | <span class="prop-name">adornedEnd</span> | <span class="prop-name">.MuiFilledInput-adornedEnd</span> | Styles applied to the root element if `endAdornment` is provided.
-| <span class="prop-name">error</span> | <span class="prop-name">.Mui-error</span> | Styles applied to the root element if `error={true}`.
+| <span class="prop-name">error</span> | <span class="prop-name">.Mui-error</span> | Pseudo-class applied to the root element if `error={true}`.
 | <span class="prop-name">marginDense</span> | <span class="prop-name">.MuiFilledInput-marginDense</span> | Styles applied to the `input` element if `margin="dense"`.
 | <span class="prop-name">multiline</span> | <span class="prop-name">.MuiFilledInput-multiline</span> | Styles applied to the root element if `multiline={true}`.
 | <span class="prop-name">input</span> | <span class="prop-name">.MuiFilledInput-input</span> | Styles applied to the `input` element.
diff --git a/docs/pages/api/input-base.md b/docs/pages/api/input-base.md
index f7aabc155212d8..dab99e618ecef7 100644
--- a/docs/pages/api/input-base.md
+++ b/docs/pages/api/input-base.md
@@ -72,7 +72,7 @@ Any other props supplied will be provided to the root element (native element).
 | <span class="prop-name">disabled</span> | <span class="prop-name">.Mui-disabled</span> | Styles applied to the root element if `disabled={true}`.
 | <span class="prop-name">adornedStart</span> | <span class="prop-name">.MuiInputBase-adornedStart</span> | Styles applied to the root element if `startAdornment` is provided.
 | <span class="prop-name">adornedEnd</span> | <span class="prop-name">.MuiInputBase-adornedEnd</span> | Styles applied to the root element if `endAdornment` is provided.
-| <span class="prop-name">error</span> | <span class="prop-name">.Mui-error</span> | Styles applied to the root element if `error={true}`.
+| <span class="prop-name">error</span> | <span class="prop-name">.Mui-error</span> | Pseudo-class applied to the root element if `error={true}`.
 | <span class="prop-name">marginDense</span> | <span class="prop-name">.MuiInputBase-marginDense</span> | Styles applied to the `input` element if `margin="dense"`.
 | <span class="prop-name">multiline</span> | <span class="prop-name">.MuiInputBase-multiline</span> | Styles applied to the root element if `multiline={true}`.
 | <span class="prop-name">colorSecondary</span> | <span class="prop-name">.MuiInputBase-colorSecondary</span> | Styles applied to the root element if the color is secondary.
diff --git a/docs/pages/api/input.md b/docs/pages/api/input.md
index 1de35b5f12f7a4..ce21230b464d1a 100644
--- a/docs/pages/api/input.md
+++ b/docs/pages/api/input.md
@@ -69,7 +69,7 @@ Any other props supplied will be provided to the root element ([InputBase](/api/
 | <span class="prop-name">disabled</span> | <span class="prop-name">.Mui-disabled</span> | Styles applied to the root element if `disabled={true}`.
 | <span class="prop-name">colorSecondary</span> | <span class="prop-name">.MuiInput-colorSecondary</span> | Styles applied to the root element if color secondary.
 | <span class="prop-name">underline</span> | <span class="prop-name">.MuiInput-underline</span> | Styles applied to the root element if `disableUnderline={false}`.
-| <span class="prop-name">error</span> | <span class="prop-name">.Mui-error</span> | Styles applied to the root element if `error={true}`.
+| <span class="prop-name">error</span> | <span class="prop-name">.Mui-error</span> | Pseudo-class applied to the root element if `error={true}`.
 | <span class="prop-name">marginDense</span> | <span class="prop-name">.MuiInput-marginDense</span> | Styles applied to the `input` element if `margin="dense"`.
 | <span class="prop-name">multiline</span> | <span class="prop-name">.MuiInput-multiline</span> | Styles applied to the root element if `multiline={true}`.
 | <span class="prop-name">fullWidth</span> | <span class="prop-name">.MuiInput-fullWidth</span> | Styles applied to the root element if `fullWidth={true}`.
diff --git a/docs/pages/api/outlined-input.md b/docs/pages/api/outlined-input.md
index 7eb4733c06abc5..8f24e6b3c180e8 100644
--- a/docs/pages/api/outlined-input.md
+++ b/docs/pages/api/outlined-input.md
@@ -71,7 +71,7 @@ Any other props supplied will be provided to the root element ([InputBase](/api/
 | <span class="prop-name">disabled</span> | <span class="prop-name">.Mui-disabled</span> | Styles applied to the root element if `disabled={true}`.
 | <span class="prop-name">adornedStart</span> | <span class="prop-name">.MuiOutlinedInput-adornedStart</span> | Styles applied to the root element if `startAdornment` is provided.
 | <span class="prop-name">adornedEnd</span> | <span class="prop-name">.MuiOutlinedInput-adornedEnd</span> | Styles applied to the root element if `endAdornment` is provided.
-| <span class="prop-name">error</span> | <span class="prop-name">.Mui-error</span> | Styles applied to the root element if `error={true}`.
+| <span class="prop-name">error</span> | <span class="prop-name">.Mui-error</span> | Pseudo-class applied to the root element if `error={true}`.
 | <span class="prop-name">marginDense</span> | <span class="prop-name">.MuiOutlinedInput-marginDense</span> | Styles applied to the `input` element if `margin="dense"`.
 | <span class="prop-name">multiline</span> | <span class="prop-name">.MuiOutlinedInput-multiline</span> | Styles applied to the root element if `multiline={true}`.
 | <span class="prop-name">notchedOutline</span> | <span class="prop-name">.MuiOutlinedInput-notchedOutline</span> | Styles applied to the `NotchedOutline` element.
diff --git a/packages/material-ui/src/FilledInput/FilledInput.js b/packages/material-ui/src/FilledInput/FilledInput.js
index d9ba768220301d..7718839cc8c4ed 100644
--- a/packages/material-ui/src/FilledInput/FilledInput.js
+++ b/packages/material-ui/src/FilledInput/FilledInput.js
@@ -97,7 +97,7 @@ export const styles = theme => {
     adornedEnd: {
       paddingRight: 12,
     },
-    /* Styles applied to the root element if `error={true}`. */
+    /* Pseudo-class applied to the root element if `error={true}`. */
     error: {},
     /* Styles applied to the `input` element if `margin="dense"`. */
     marginDense: {},
diff --git a/packages/material-ui/src/Input/Input.js b/packages/material-ui/src/Input/Input.js
index cf15942fc83c4e..5f9745533ebdc1 100644
--- a/packages/material-ui/src/Input/Input.js
+++ b/packages/material-ui/src/Input/Input.js
@@ -78,7 +78,7 @@ export const styles = theme => {
         borderBottomStyle: 'dotted',
       },
     },
-    /* Styles applied to the root element if `error={true}`. */
+    /* Pseudo-class applied to the root element if `error={true}`. */
     error: {},
     /* Styles applied to the `input` element if `margin="dense"`. */
     marginDense: {},
diff --git a/packages/material-ui/src/InputBase/InputBase.js b/packages/material-ui/src/InputBase/InputBase.js
index 955a57f420df61..827e98514dbf1b 100644
--- a/packages/material-ui/src/InputBase/InputBase.js
+++ b/packages/material-ui/src/InputBase/InputBase.js
@@ -63,7 +63,7 @@ export const styles = theme => {
     adornedStart: {},
     /* Styles applied to the root element if `endAdornment` is provided. */
     adornedEnd: {},
-    /* Styles applied to the root element if `error={true}`. */
+    /* Pseudo-class applied to the root element if `error={true}`. */
     error: {},
     /* Styles applied to the `input` element if `margin="dense"`. */
     marginDense: {},
diff --git a/packages/material-ui/src/OutlinedInput/OutlinedInput.js b/packages/material-ui/src/OutlinedInput/OutlinedInput.js
index 9ef340a354c74b..884c1117ea6d2f 100644
--- a/packages/material-ui/src/OutlinedInput/OutlinedInput.js
+++ b/packages/material-ui/src/OutlinedInput/OutlinedInput.js
@@ -53,7 +53,7 @@ export const styles = theme => {
     adornedEnd: {
       paddingRight: 14,
     },
-    /* Styles applied to the root element if `error={true}`. */
+    /* Pseudo-class applied to the root element if `error={true}`. */
     error: {},
     /* Styles applied to the `input` element if `margin="dense"`. */
     marginDense: {},