Document that --build_tag_filters does not affect test targets when running `blaze test`.
@@ -1127,6 +1127,11 @@ memory-saving mode</a>.
preceded with '-' sign used to denote excluded tags. Required tags may also
have a preceding '+' sign.
</p>
+<p>
+ When running tests, Bazel ignores <code class='flag'>--build_tag_filters</code> for test targets,
+ which are built and run even if they do not match this filter. To avoid building them, filter
+ test targets using <code class='flag'>--test_tag_filters</code> or by explicitly excluding them.
+</p>
<h4 id='flag--test_size_filters'><code class='flag'>--test_size_filters <var>size[,size]*</var></code></h4>
<p>
