added PKIX1-related FAQ entry
diff --git a/FAQ b/FAQ
index 97b097e..d654f3f 100644
--- a/FAQ
+++ b/FAQ
@@ -12,3 +12,26 @@
Canonical Encoding Rules (CER) and
Distinguished Encoding Rules (DER)"
+
+Q: I've tried doing ./asn1c/asn1c -P examples/*PKIX*93*, but compiler spits
+ several fatal failures and exits.
+A:
+ The PKIX1 specifications uses ASN.1 Information Object Classes,
+ which is arguably one of the most complex ASN.1 concepts.
+
+ The asn1c parser and fixer subsystems currently understand most of
+ IOC syntax, but the compiler can cope with only the very basic
+ IOC semantics.
+
+ The goal of asn1c is to adequately support the practically necessary
+ subset of IOCs to compile PKIX1 and other real-world specs,
+ but this milestone isn't yet reached. Please contact me in case
+ you have special requirements, we can work it out.
+
+ P.S. Parser and fixer are now able to grok PKIX1, try this out:
+
+ ./asn1c/asn1c -E -F examples/*PKIX*93*
+
+--
+Lev Walkin
+vlm@lionet.info