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-rw-r--r--docs/src/main.dox5
1 files changed, 5 insertions, 0 deletions
diff --git a/docs/src/main.dox b/docs/src/main.dox
index 6eda34beb..fee2af8e5 100644
--- a/docs/src/main.dox
+++ b/docs/src/main.dox
@@ -401,6 +401,11 @@
* <h3>Reading or writing on pins associated to other functionalities</h3>
* The behavior is not specified.
*
+ * <h2>Usage</h2>
+ * The use of I/O ports requires the inclusion of the header file @p ioports.h,
+ * this file is not automatically included @o ch.h like the other header
+ * files.
+ *
* @ingroup IO
*/