diff --git a/doc/bugs/img_plugin_causes_taint_failure.mdwn b/doc/bugs/img_plugin_causes_taint_failure.mdwn
new file mode 100644
index 000000000..094c07f37
--- /dev/null
+++ b/doc/bugs/img_plugin_causes_taint_failure.mdwn
@@ -0,0 +1,10 @@
+The img plugin causes a taint failure if one tries to link a scaled image, e.g.
+
+    \[[img foo.png size=64x64]]
+
+    .ikiwiki.setup: Insecure dependency in mkdir while running with -T switch at /usr/lib/perl5/vendor_perl/5.8.8/IkiWiki.pm line 360.
+    BEGIN failed--compilation aborted at (eval 5) line 109.
+
+If one omits the size argument it works. And if it worked once the taint failure will not happen again unless one rm -r's the destdir.
+
+Seen with ikiwiki 2.30