diff --git a/modules/renderer/tile_layer.js b/modules/renderer/tile_layer.js
index be2d5a951..c681454e6 100644
--- a/modules/renderer/tile_layer.js
+++ b/modules/renderer/tile_layer.js
@@ -198,6 +198,7 @@ export function rendererTileLayer(context) {
         image.enter()
           .append('img')
             .attr('class', 'tile')
+            .attr('alt', '')
             .attr('draggable', 'false')
             .style('width', _tileSize + 'px')
             .style('height', _tileSize + 'px')
diff --git a/modules/ui/tag_reference.js b/modules/ui/tag_reference.js
index 66a40a078..3b21fe357 100644
--- a/modules/ui/tag_reference.js
+++ b/modules/ui/tag_reference.js
@@ -53,6 +53,7 @@ export function uiTagReference(what) {
             _body
                 .append('img')
                 .attr('class', 'tag-reference-wiki-image')
+                .attr('alt', docs.description)
                 .attr('src', docs.imageURL)
                 .on('load', function() { done(); })
                 .on('error', function() { d3_select(this).remove(); done(); });