diff --git a/topics/reference_guide/custom_language_support/syntax_highlighting_and_error_highlighting.md b/topics/reference_guide/custom_language_support/syntax_highlighting_and_error_highlighting.md
index d331cdd21..e2b75c897 100644
--- a/topics/reference_guide/custom_language_support/syntax_highlighting_and_error_highlighting.md
+++ b/topics/reference_guide/custom_language_support/syntax_highlighting_and_error_highlighting.md
@@ -45,6 +45,13 @@ For highlighting lexer errors, the standard `TextAttributesKey` for bad characte
 >
 {type="tip"}
 
+### Semantic ("Rainbow") Highlighting
+
+[Semantic highlighting](https://www.jetbrains.com/help/idea/configuring-colors-and-fonts.html#semantic-highlighting) provides an additional coloring layer to improve the visual distinction of several related items (e.g., method parameters).
+
+Register [`RainbowVisitor`](upsource:///platform/analysis-impl/src/com/intellij/codeInsight/daemon/RainbowVisitor.java) in `com.intellij.highlightVisitor` extension point.
+[](#color-settings) must implement [`RainbowColorSettingsPage`](upsource:///platform/platform-api/src/com/intellij/openapi/options/colors/RainbowColorSettingsPage.java) in addition.
+
 ## Parser
 
 The second level of error highlighting happens during parsing.