diff --git a/CHANGELOG b/CHANGELOG
index aed27e63d..04e5581a9 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,14 @@
 # Nmap Changelog ($Id$); -*-text-*-
 
+o There is a new OS detection test called SEQ.CI. Like TI and II, CI
+  classifies the target's IP ID sequence generation algorithm. CI is
+  based on the responses received to the probes sent to a closed port.
+  The algorithm for closed ports has been observed to differ from that
+  for open ports, though for what operating systems this happens is
+  not yet known. The new test won't have an effect until new
+  fingerprints containing it are added to nmap-os-db. Dario Ciccarone
+  suggested this enhancement. [David]
+
 o OS fingerprints now include the SEQ.II test (ICMP IP ID sequence
   generation) even if there are no other SEQ test results. [David]
 
diff --git a/nmap-os-db b/nmap-os-db
index b127882e6..c1497c0e5 100644
--- a/nmap-os-db
+++ b/nmap-os-db
@@ -32,7 +32,7 @@
 # are used when there are no perfect matches to determine which OS
 # fingerprint matches a target machine most closely.
 MatchPoints
-SEQ(SP=25%GCD=75%ISR=25%TI=100%II=100%SS=80%TS=100)
+SEQ(SP=25%GCD=75%ISR=25%TI=100%CI=0%II=100%SS=80%TS=100)
 OPS(O1=20%O2=20%O3=20%O4=20%O5=20%O6=20)
 WIN(W1=15%W2=15%W3=15%W4=15%W5=15%W6=15)
 ECN(R=100%DF=20%T=15%TG=15%W=15%O=15%CC=100%Q=20)