Documentation missing parameter descriptions
diff --git a/README.md b/README.md
index 2a8b8f4..2b1c2c7 100644
--- a/README.md
+++ b/README.md
@@ -54,6 +54,9 @@
 The `/whisk.system/pushnotifications/sendMessage` action sends push notifications to registered devices. The parameters are as follows:
 - `text`: The notification message to be shown to the user. For example: `-p text "Hi ,OpenWhisk send a notification"`.
 - `url`: An optional URL that can be sent along with the alert. For example: `-p url "https:\\www.w3.ibm.com"`.
+- `deviceIds` The list of specified devices. For example: `-p deviceIds ["deviceID1"]`.
+- `platforms` Send notification to the devices of the specified platforms. 'A' for apple (iOS) devices and 'G' for google (Android) devices. For example `-p platforms ["A"]`.
+- `tagNames` Send notification to the devices that have subscribed to any of these tags. For example `-p tagNames "["tag1"]" `.
 - `gcmPayload`: Custom JSON payload that will be sent as part of the notification message. For example: `-p gcmPayload "{"hi":"hello"}"`
 - `gcmSound`: The sound file (on device) that will be attempted to play when the notification arrives on the device.
 - `gcmCollapseKey`: This parameter identifies a group of messages
@@ -166,4 +169,4 @@
 2. cd openwhisk-package-pushnotifications/packages
 3. ./installCatalog.sh AUTH APIHOST NAMESPACE WSK_CLI
    AUTH is your auth key.  APIHOST is the OpenWhisk hostname.  NAMESPACE is the namespace to install the package in.  WSK_CLI is location of the Openwhisk CLI binary.
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