diff --git a/pages/develop/navigation.txt b/pages/develop/navigation.txt
index 393202368..d8dfc760c 100644
--- a/pages/develop/navigation.txt
+++ b/pages/develop/navigation.txt
@@ -26,6 +26,7 @@
         * [[/develop/guides/c/eina/tools/eina-mempool.md]]
         * [[/develop/guides/c/eina/tools/eina-safety-checks.md]]
     * [[/develop/guides/c/core/main-loop.md | Main Loop]]
+    * [[/develop/guides/c/core/io.md | I/O]]
     * [[/develop/guides/c/core/events.md | Events]]
     * [[/develop/guides/c/ui/sizing.md | UI Sizing]]
     * [[/develop/guides/c/porting-guide.md | Legacy Porting Guide]]