Document CSS classes breaking changes

mui · Aug 3, 2020 · 5e399a2 · 5e399a2
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commit 5e399a2
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diff --git a/docs/src/pages/guides/migration-v4/migration-v4.md b/docs/src/pages/guides/migration-v4/migration-v4.md
@@ -97,9 +97,15 @@ This change affects almost all components where you're using the `component` pro
 
   ```diff
   -<CircularProgress variant="static" />
+  -<CircularProgress variant="static" classes={{ static: 'cclassname' }} />
+  -<CircularProgress variant="determinate" classes={{ determinate: 'classname' }} />
   +<CircularProgress variant="determinate" />
+  +<CircularProgress variant="determinate" classes={{ determinate: 'cclassname' }} />
+  -<CircularProgress variant="determinate" />
   ```
 
+> NB: If you had previously customised determinate, your customisations are probably no longer valid. Please remove them.
+
 ### Collapse
 
 - The `collapsedHeight` prop was renamed `collapsedSize` to support the horizontal direction.