diff --git a/topics/appendix/api_notable/api_notable_list_2020.md b/topics/appendix/api_notable/api_notable_list_2020.md
index 7cbd2dea4..e94983e7a 100644
--- a/topics/appendix/api_notable/api_notable_list_2020.md
+++ b/topics/appendix/api_notable/api_notable_list_2020.md
@@ -78,7 +78,7 @@ FileType mapping via hashbang (`#!`)
: Specify `hashBangs` attribute in . [Issue](https://youtrack.jetbrains.com/issue/IDEA-175757)
Add information to About dialog
-: Implement [.
+: Implement [`AboutPopupDescriptionProvider`](%gh-ic%/platform/platform-impl/src/com/intellij/ide/AboutPopupDescriptionProvider.kt) and register in .
Previewing Intention/Quick Fix
: To support preview in intention popup, suitable [`FileModifier`](%gh-ic%/platform/analysis-api/src/com/intellij/codeInsight/intention/FileModifier.java) must be provided (default implementation `FileModifier.getFileModifierForPreview()` works for most cases).