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intellij-sdk-code-samples/reference_guide/custom_language_support/documentation.md
Artem Khvastunov 63867aee67 actualized 'Custom Language Support' section 
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title
Documentation

To provide different kinds of documentation support (tooltips on Ctrl-hover, quick documentation popup etc.), the plugin needs to provide an implementation of the DocumentationProvider interface and register it in the lang.documentationProvider extension point. A standard base class for such implementations is available in the class AbstractDocumentationProvider.

Example: DocumentationProvider for Properties language plugin

The getQuickNavigateInfo() method returns the text to be displayed when the user holds the mouse over an element with Ctrl pressed.