diff --git a/documentation/content/en/books/porters-handbook/uses/_index.adoc b/documentation/content/en/books/porters-handbook/uses/_index.adoc
--- a/documentation/content/en/books/porters-handbook/uses/_index.adoc
+++ b/documentation/content/en/books/porters-handbook/uses/_index.adoc
@@ -1868,6 +1868,13 @@
 `USES=python:env` can be used when the variables exported by the framework are needed but a dependency on Python is not.
 It can happen when using with crossref:uses[uses-shebangfix,`USES=shebangfix`], and the goal is only to fix the shebangs but not add a dependency on Python.
 
+[[uses-qca]]
+== `qca`
+
+Possible arguments: (none)
+
+Handle dependency on the package:devel/qca[] crypto API.
+
 [[uses-qmail]]
 == `qmail`