add alt tag

diff --git a/doc/news/code_swarm.mdwn b/doc/news/code_swarm.mdwn
index bdc37343225897f7aabd8b2b747a963afede97cf..09b68523eaddb1932dd0a19a1e82ede32004ad2e 100644 (file)
--- a/doc/news/code_swarm.mdwn
+++ b/doc/news/code_swarm.mdwn
@@ -1,7 +1,7 @@
 I've produced a [code_swarm](http://vis.cs.ucdavis.edu/~ogawa/codeswarm/)
 visualization of the first 2+ years of ikiwiki's commit history. 
 
-[[!img screenshot.png size="480x360"]]
+[[!img screenshot.png size="480x360" alt="screenshot"]]
 
 * [15 mb avi](http://kitenet.net/~joey/screencasts/ikiwiki_swarm.avi)
 * [stream on vimeo](http://vimeo.com/1324348)