diff --git a/src/compatibility/4.1/android-4.1-cdd.pdf b/src/compatibility/4.1/android-4.1-cdd.pdf
new file mode 100644
index 0000000..dab2857
--- /dev/null
+++ b/src/compatibility/4.1/android-4.1-cdd.pdf
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diff --git a/src/compatibility/4.1/versions.md b/src/compatibility/4.1/versions.md
new file mode 100644
index 0000000..26ae803
--- /dev/null
+++ b/src/compatibility/4.1/versions.md
@@ -0,0 +1,34 @@
+<!--
+   Copyright 2010 The Android Open Source Project 
+
+   Licensed under the Apache License, Version 2.0 (the "License"); 
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+-->
+
+# Permitted Version Strings for Android 4.1 #
+
+As described in Section 3.2.2 of the [Android 4.1 Compatibility Definition](/cdds/android-4.1-cdd.pdf), 
+only certain strings are allowable for the system property
+`android.os.Build.VERSION.RELEASE`. The reason for this is that
+applications and web sites may rely on predictable values for this string, and
+so that end users can easily and reliably identify the version of Android
+running on their devices.
+
+Because subsequent releases of the Android software may revise this string,
+but not change any API behavior, such releases may not be accompanied by a new
+Compatibility Definition Document. This page lists the versions that are
+allowable by an Android 4.0-based system. The only permitted values for
+`android.os.Build.VERSION.RELEASE` for Android 4.1 are:
+
+- 4.1
+
+- 4.1.1
diff --git a/src/compatibility/android-4.1-cdd.pdf b/src/compatibility/android-4.1-cdd.pdf
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diff --git a/src/compatibility/android-cts-manual-r4.pdf b/src/compatibility/android-cts-manual-r4.pdf
deleted file mode 100644
index a5861ac..0000000
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diff --git a/src/compatibility/android-cts-manual-r5.pdf b/src/compatibility/android-cts-manual-r5.pdf
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diff --git a/src/compatibility/downloads.md b/src/compatibility/downloads.md
index fb7c7a8..faf9310 100644
--- a/src/compatibility/downloads.md
+++ b/src/compatibility/downloads.md
@@ -19,6 +19,17 @@
 Thanks for your interest in Android Compatibility! The links below allow
 you to access the key documents and information.
 
+## Android 4.1 ##
+
+Android 4.1.1 is the release of the development milestone code-named
+Ice Cream Sandwich. Android 4.1.1 is the current version of Android. Source code for
+Android 4.1.1 is found in the 'android-4.1.1_r1' branch in the open-source tree.
+
+- [Android 4.1 Compatibility Definition Document (CDD)](4.1/android-4.1-cdd.pdf)
+- [Android 4.1 R3 Compatibility Test Suite (CTS)](https://dl.google.com/dl/android/cts/android-cts-4.1_r1-linux_x86-arm.zip)
+- [Android 4.1 R2 CTS Verifier](https://dl.google.com/dl/android/cts/android-cts-verifier-4.1_r1-linux_x86-arm.zip)
+
+
 ## Android 4.0.3 ##
 
 Android 4.0.3 is the release of the development milestone code-named
diff --git a/src/compatibility/overview.md b/src/compatibility/overview.md
index bd3be2d..627334c 100644
--- a/src/compatibility/overview.md
+++ b/src/compatibility/overview.md
@@ -102,7 +102,7 @@
 If you want to build a device compatible with a given Android version,
 start by checking out the source code for that version, and then read the
 corresponding CDD and stay within its guidelines. For additional details,
-simply examine [the latest CDD](4.0/android-4.0-cdd.pdf).
+simply examine [the latest CDD](4.1/android-4.1-cdd.pdf).
 
 # Compatibility Test Suite (CTS) #