Update README.md

Test: None

Change-Id: Ifb8b975701302bb6432a3d0f226b8467958c26ba
diff --git a/README.md b/README.md
index c995872..732423f 100644
--- a/README.md
+++ b/README.md
@@ -5,8 +5,12 @@
 *   Python 2.7
 *   simg2img
     *   Used to unsparse Android sparse images
-    *   Either make it available in `PATH` or set `SIMG2IMG_BIN` to the path of
-        the `simg2img` binary
+    *   Source code available at https://android.googlesource.com/platform/system/core/+/master/libsparse/
+    *   Prebuilt binaries
+        *   Debian >= Stretch or Ubuntu >= 17.10
+            *   sudo apt-get install simg2img
+    *   The `simg2img` binary should either be available in `PATH` or `SIMG2IMG_BIN` should be set to its path.
+*   This currently lives in AOSP here: https://android.googlesource.com/platform/system/iot/tools/
 
 
 **Factory image downloaded from console in both slots:**
@@ -25,3 +29,10 @@
 --partition system_a custom_system.img \
 --partition vbmeta_a custom_vbmeta.img
 ```
+
+
+**Dump partition table:**
+
+```
+parted emmc.img
+```