Update docs for crypto providers

1 files changed, 6 insertions, 3 deletions

diff --git a/TODO b/TODO
index 90bf6de2..9a178fe6 100644
--- a/TODO
+++ b/TODO
@@ -272,10 +272,13 @@ I find it useful to make reference to them in this list
    to add any dependencies on threading libraries.
 
  * Study what's required to support savable forms that can be saved by
-   Adobe Reader.  Does this require actually signing the document with
-   an Adobe private key?  Search for "Digital signatures" in the PDF
+   Adobe Reader. Does this require actually signing the document with
+   an Adobe private key? Search for "Digital signatures" in the PDF
    spec, and look at ~/Q/pdf-collection/form-with-full-save.pdf, which
-   came from Adobe's example site.
+   came from Adobe's example site. See also
+   ../misc/digital-sign-from-trueroad/. If digital signatures are
+   implemented, update the docs on crytpo providers, which mention
+   that this may happen in the future.
 
  * See if we can avoid preserving unreferenced objects in object
    streams even when preserving the object streams.