diff --git a/docs/UsersManual.html b/docs/UsersManual.html
index a271dc3..f4e414a 100644
--- a/docs/UsersManual.html
+++ b/docs/UsersManual.html
@@ -889,7 +889,9 @@
 <li>clang does not support the gcc extension that allows variable-length arrays
 in structures.  This is for a few of reasons: one, it is tricky
 to implement, two, the extension is completely undocumented, and three, the
-extension appears to be rarely used.</li>
+extension appears to be rarely used.  Note that clang <em>does</em> support
+flexible array members (arrays with a zero or unspecified size at the end of
+a structure).</li>
 
 <li>clang does not support duplicate definitions of a function where one is
 inline. This complicates clients of the AST which normally can expect there is