diff --git a/pkg/qcbor/doc.txt b/pkg/qcbor/doc.txt
index 9f192a0a4171..6e309c3b28d0 100644
--- a/pkg/qcbor/doc.txt
+++ b/pkg/qcbor/doc.txt
@@ -13,4 +13,16 @@
  * USEPKG += qcbor
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  *
- */
\ No newline at end of file
+ * Disabling features
+ * ------------------
+ *
+ * As explained in the [README](https://github.com/laurencelundblade/QCBOR#disabling-features), qcbor
+ * provides options to disable some features and reduce code size.
+ * Just add them to `CFLAGS` in the application `Makefile` or directly to the command line.
+ * For example, in the command line:
+ *
+ * ```
+ * CFLAGS="-DQCBOR_DISABLE_INDEFINITE_LENGTH_STRINGS" BOARD=samr21-xpro make -C tests/pkg_qcbor
+ * ```
+ *
+ */