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-rw-r--r--include/wlr/render/drm_format_set.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/wlr/render/drm_format_set.h b/include/wlr/render/drm_format_set.h
index 0a6254e2..c8f3c309 100644
--- a/include/wlr/render/drm_format_set.h
+++ b/include/wlr/render/drm_format_set.h
@@ -73,7 +73,8 @@ bool wlr_drm_format_set_add(struct wlr_drm_format_set *set, uint32_t format,
/**
* Intersect two DRM format sets `a` and `b`, storing in the destination set
- * `dst` the format + modifier pairs which are in both source sets.
+ * `dst` the format + modifier pairs which are in both source sets. The `dst`
+ * must either be zeroed or initialized with other state to be replaced.
*
* Returns false on failure or when the intersection is empty.
*/