diff --git a/contrib/guix/manifest.scm b/contrib/guix/manifest.scm
index dc7c5dd1..538ba8a1 100644
--- a/contrib/guix/manifest.scm
+++ b/contrib/guix/manifest.scm
@@ -475,7 +475,7 @@ inspecting signatures in Mach-O binaries.")
         ;; Build tools
         gnu-make
         pkg-config
-        bison
+        bison ; used to build libxkbcommon in depends
         gettext-minimal
         cmake-minimal
         meson ; used to build libfuse, wayland, libXau, libxkbcommon in depends