diff --git a/README.md b/README.md
index 7294b728860593..1f79bfc452d264 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ Please note that `@next` will only point to pre-releases; to get the latest stab
 
 ### Diamond 💎
 
-Diamond Sponsors are those who have pledged $2,000/month or more to Material-UI.
+Diamond Sponsors are those who have pledged $1,500/month or more to Material-UI.
 
 ### Gold 🏆
 
diff --git a/docs/pages/api/divider.md b/docs/pages/api/divider.md
index 71d46c4a76be24..8f54a7fc012194 100644
--- a/docs/pages/api/divider.md
+++ b/docs/pages/api/divider.md
@@ -27,7 +27,7 @@ You can learn more about the difference by [reading this guide](/guides/minimizi
 | <span class="prop-name">absolute</span> | <span class="prop-type">bool</span> | <span class="prop-default">false</span> | Absolutely position the element. |
 | <span class="prop-name">classes</span> | <span class="prop-type">object</span> |  | Override or extend the styles applied to the component. See [CSS API](#css) below for more details. |
 | <span class="prop-name">component</span> | <span class="prop-type">elementType</span> | <span class="prop-default">'hr'</span> | The component used for the root node. Either a string to use a DOM element or a component. |
-| <span class="prop-name">flexItem</span> | <span class="prop-type">bool</span> | <span class="prop-default">false</span> | If `true`, the divider will adapt to a parent flex container. |
+| <span class="prop-name">flexItem</span> | <span class="prop-type">bool</span> | <span class="prop-default">false</span> | If `true`, a vertical divider will have the correct height when used in flex container. (By default, a vertical divider will have a calculated height of `0px` if it is the child of a flex container.) |
 | <span class="prop-name">light</span> | <span class="prop-type">bool</span> | <span class="prop-default">false</span> | If `true`, the divider will have a lighter color. |
 | <span class="prop-name">orientation</span> | <span class="prop-type">'horizontal'<br>&#124;&nbsp;'vertical'</span> | <span class="prop-default">'horizontal'</span> | The divider orientation. |
 | <span class="prop-name">variant</span> | <span class="prop-type">'fullWidth'<br>&#124;&nbsp;'inset'<br>&#124;&nbsp;'middle'</span> | <span class="prop-default">'fullWidth'</span> | The variant to use. |
diff --git a/docs/src/pages/company/software-engineer/software-engineer.md b/docs/src/pages/company/software-engineer/software-engineer.md
index f2fe239589d1c7..a63e1544c5dd52 100644
--- a/docs/src/pages/company/software-engineer/software-engineer.md
+++ b/docs/src/pages/company/software-engineer/software-engineer.md
@@ -67,7 +67,6 @@ Premium components:
 
 - **You’ve contributed to a design system before**. You have worked on enterprise components in the past, maybe for internal usage in your company. You have built complex and advanced features while making sure the accessibility was fully functional.
 - **You’ve maintained an active repository before**. Maybe you’ve helped maintain a popular open source repo, or perhaps you’ve worked on internal repos that saw contributions from multiple teams. Previous experience with highly active repo workflows is a definite plus for this role.
-- **You have used Material-UI before**. You have built a non trivial application with Material-UI in the past. You know the limitations of the library, you know a few areas that could be improved.
 - **You have contributed code to Material-UI before**. A history of contributing to Material-UI would be a definite plus.
 
 ## The best parts of this job
diff --git a/docs/src/pages/components/drawers/ResponsiveDrawer.js b/docs/src/pages/components/drawers/ResponsiveDrawer.js
index d5a0163d5b12d1..f64121475bf98b 100644
--- a/docs/src/pages/components/drawers/ResponsiveDrawer.js
+++ b/docs/src/pages/components/drawers/ResponsiveDrawer.js
@@ -170,7 +170,7 @@ ResponsiveDrawer.propTypes = {
    * Injected by the documentation to work in an iframe.
    * You won't need it on your project.
    */
-  container: PropTypes.instanceOf(typeof Element === 'undefined' ? Object : Element),
+  container: PropTypes.any,
 };
 
 export default ResponsiveDrawer;
diff --git a/docs/src/pages/components/drawers/ResponsiveDrawer.tsx b/docs/src/pages/components/drawers/ResponsiveDrawer.tsx
index 124136ce1326f6..85acc46c622967 100644
--- a/docs/src/pages/components/drawers/ResponsiveDrawer.tsx
+++ b/docs/src/pages/components/drawers/ResponsiveDrawer.tsx
@@ -57,7 +57,7 @@ interface ResponsiveDrawerProps {
    * Injected by the documentation to work in an iframe.
    * You won't need it on your project.
    */
-  container?: Element;
+  container?: any;
 }
 
 export default function ResponsiveDrawer(props: ResponsiveDrawerProps) {
diff --git a/docs/src/pages/components/icons/icons.md b/docs/src/pages/components/icons/icons.md
index bc02e572d2ed6a..66fe9a96d743a3 100644
--- a/docs/src/pages/components/icons/icons.md
+++ b/docs/src/pages/components/icons/icons.md
@@ -15,7 +15,7 @@ Material-UI provides icons support in three ways:
 
 ## Material Icons
 
-Material Design has standardized over 1,000 official icons, each in five different "themes" (see below). For each SVG icon, we export the respective React component from the @material-ui/icons package. You can [search the full list of these icons](/components/material-icons/).
+Material Design has standardized over 1,100 official icons, each in five different "themes" (see below). For each SVG icon, we export the respective React component from the @material-ui/icons package. You can [search the full list of these icons](/components/material-icons/).
 
 ### Usage
 
@@ -101,7 +101,7 @@ import StarIcon from './star.svg';
 
 #### Material Design (recommended)
 
-Material Design has standardized over [1,000 official icons](#material-icons).
+Material Design has standardized over [1,100 official icons](#material-icons).
 
 #### MDI
 
diff --git a/docs/src/pages/components/material-icons/material-icons.md b/docs/src/pages/components/material-icons/material-icons.md
index c00b7f3ea5e51b..9f23f1e4204b7a 100644
--- a/docs/src/pages/components/material-icons/material-icons.md
+++ b/docs/src/pages/components/material-icons/material-icons.md
@@ -5,11 +5,11 @@ components: Icon, SvgIcon
 
 # Material Icons
 
-<p class="description">1,000+ React Material icons ready to use from the official website.</p>
+<p class="description">1,100+ React Material icons ready to use from the official website.</p>
 
 The following npm package,
 [@material-ui/icons](https://www.npmjs.com/package/@material-ui/icons),
-includes the 1,000+ official [Material icons](https://material.io/tools/icons/?style=baseline) converted to [`SvgIcon`](/api/svg-icon/) components.
+includes the 1,100+ official [Material icons](https://material.io/tools/icons/?style=baseline) converted to [`SvgIcon`](/api/svg-icon/) components.
 
 {{"demo": "pages/components/material-icons/SearchIcons.js", "hideHeader": true, "bg": true}}
 
diff --git a/docs/src/pages/components/selects/selects.md b/docs/src/pages/components/selects/selects.md
index a9301a1cd88e95..c8f7b34ad6f37d 100644
--- a/docs/src/pages/components/selects/selects.md
+++ b/docs/src/pages/components/selects/selects.md
@@ -13,6 +13,13 @@ Menus are positioned over their emitting elements such that the currently select
 
 {{"demo": "pages/components/selects/SimpleSelect.js"}}
 
+## Advanced features
+
+The Select component is meant to be interchangeable with a native `<select>` element.
+
+If you are looking for more advanced features, like combobox, multiselect, autocomplete, async or creatable support, head to the [`Autocomplete` component](/components/autocomplete/).
+It's also meant to be an improved version of the "react-select" package.
+
 ## Native Select
 
 As the user experience can be improved on mobile using the native select of the platform,
diff --git a/docs/src/pages/discover-more/backers/backers.md b/docs/src/pages/discover-more/backers/backers.md
index a93fdbf6e46794..ff9bec2c9c940c 100644
--- a/docs/src/pages/discover-more/backers/backers.md
+++ b/docs/src/pages/discover-more/backers/backers.md
@@ -10,7 +10,7 @@ The core of Material-UI is a crowd-funded open-source project, licensed under th
 
 *3/3 slots available*
 
-Diamond Sponsors are those who have pledged $2,000/month or more to Material-UI.
+Diamond Sponsors are those who have pledged $1,500/month or more to Material-UI.
 Please contact us at diamond@material-ui.com to subscribe to this tier.
 
 ### Gold 🏆
diff --git a/packages/material-ui/src/Divider/Divider.js b/packages/material-ui/src/Divider/Divider.js
index e97b5086dd404e..63ae92db4c9469 100644
--- a/packages/material-ui/src/Divider/Divider.js
+++ b/packages/material-ui/src/Divider/Divider.js
@@ -99,7 +99,8 @@ Divider.propTypes = {
    */
   component: PropTypes.elementType,
   /**
-   * If `true`, the divider will adapt to a parent flex container.
+   * If `true`, a vertical divider will have the correct height when used in flex container.
+   * (By default, a vertical divider will have a calculated height of `0px` if it is the child of a flex container.)
    */
   flexItem: PropTypes.bool,
   /**