README: mention *attribute-quote-char* difference.

Test case 8 had to be adjusted to bind *attribute-quote-char*
using expander-let instead of let, so this is a difference
worth mentioning.

1 files changed, 7 insertions, 0 deletions

diff --git a/README.md b/README.md
index 7b569a5..fffa92d 100644
--- a/README.md
+++ b/README.md
@@ -123,6 +123,13 @@ Here are the differences to be aware of:
     library doesn't translate embedded Common Lisp to TXR Lisp;
     it only translates the markup syntax to HTML in the same way as CL-WHO.
 
+*   The variable `*attribute-quote-char*` will not work if it is bound by
+    `let` around a `with-html-output-form`. The reason is that TL-WHO
+    interpolates this character at macro-expansion time, even for
+    HTML attributes whose values are calculated at run-time.
+    The binding construct `expander-let` must be used, or else the
+    variable's global binding must be assigned.
+
 Additionally, users (of CL-WHO and TL-WHO alike) are advised to watch for the
 following issue: the CL-WHO documentation is not accurately maintained and
 makes some references to material that no longer exists in CL-WHO, such as the