Add some more verbosity to drm_bo_set_pin_req comments.

1 files changed, 3 insertions, 1 deletions

diff --git a/shared-core/drm.h b/shared-core/drm.h
index 28275169..30c7a1a3 100644
--- a/shared-core/drm.h
+++ b/shared-core/drm.h
@@ -792,7 +792,9 @@ struct drm_bo_set_pin_req {
 	unsigned int handle;
 	/**
 	 * - 0: Unpin the given buffer object.
-	 * - 1: Pin the given buffer object.
+	 * - 1: Pin the given buffer object, requiring that its offset and
+	 * memory area stay constant until unpin.  The intended use is for
+	 * scanout buffers.
 	 */
 	unsigned int pin;
 };