1 files changed, 1 insertions, 0 deletions

diff --git a/include/sway/tree/container.h b/include/sway/tree/container.h
index 5c368df2..2c973f71 100644
--- a/include/sway/tree/container.h
+++ b/include/sway/tree/container.h
@@ -285,6 +285,7 @@ bool container_is_fullscreen_or_child(struct sway_container *container);
 /**
  * Return the output which will be used for scale purposes.
  * This is the most recently entered output.
+ * If the container is not on any output, return NULL.
  */
 struct sway_output *container_get_effective_output(struct sway_container *con);