diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5db8c31b..5901e3f0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+v0.21b (December 4, 2016)
+-------------------------
+
+This update corrects a first-time installation issue introduced in v0.21 caused by the new Exchange/ActiveSync feature.
+
 v0.21 (November 30, 2016)
 -------------------------
 
diff --git a/README.md b/README.md
index 225be813..173a159f 100644
--- a/README.md
+++ b/README.md
@@ -59,7 +59,7 @@ by me:
 	$ curl -s https://keybase.io/joshdata/key.asc | gpg --import
 	gpg: key C10BDD81: public key "Joshua Tauberer <jt@occams.info>" imported
 
-	$ git verify-tag v0.21
+	$ git verify-tag v0.21b
 	gpg: Signature made ..... using RSA key ID C10BDD81
 	gpg: Good signature from "Joshua Tauberer <jt@occams.info>"
 	gpg: WARNING: This key is not certified with a trusted signature!
@@ -72,7 +72,7 @@ and on my [personal homepage](https://razor.occams.info/). (Of course, if this r
 
 Checkout the tag corresponding to the most recent release:
 
-	$ git checkout v0.21
+	$ git checkout v0.21b
 
 Begin the installation.
 
diff --git a/setup/bootstrap.sh b/setup/bootstrap.sh
index bcd87b86..51aa7af0 100644
--- a/setup/bootstrap.sh
+++ b/setup/bootstrap.sh
@@ -7,7 +7,7 @@
 #########################################################
 
 if [ -z "$TAG" ]; then
-	TAG=v0.21
+	TAG=v0.21b
 fi
 
 # Are we running as root?