From f5399de58d406afc9a7a2ef4119acedeb8196fba Mon Sep 17 00:00:00 2001
From: ahocevar <andreas.hocevar@gmail.com>
Date: Mon, 28 May 2018 10:39:29 +0200
Subject: [PATCH] Improve API docs

---
 src/ol/source/Raster.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/ol/source/Raster.js b/src/ol/source/Raster.js
index 100698291e..6f488215eb 100644
--- a/src/ol/source/Raster.js
+++ b/src/ol/source/Raster.js
@@ -113,7 +113,8 @@ inherits(RasterSourceEvent, Event);
 
 /**
  * @typedef {Object} Options
- * @property {Array.<module:ol/source/Source|module:ol/layer/Layer>} sources Input sources or layers.
+ * @property {Array.<module:ol/source/Source|module:ol/layer/Layer>} sources Input
+ * sources or layers. Vector layers must be configured with `renderMode: 'image'`.
  * @property {module:ol/source/Raster~Operation} [operation] Raster operation.
  * The operation will be called with data from input sources
  * and the output will be assigned to the raster source.