diff --git a/Libraries/ActionSheetIOS/ActionSheetIOS.js b/Libraries/ActionSheetIOS/ActionSheetIOS.js
index a6f5dc2342af8a..c76a1beeb94198 100644
--- a/Libraries/ActionSheetIOS/ActionSheetIOS.js
+++ b/Libraries/ActionSheetIOS/ActionSheetIOS.js
@@ -17,10 +17,20 @@ var invariant = require('fbjs/lib/invariant');
 var processColor = require('processColor');
 
 var ActionSheetIOS = {
+  /**
+   * Display an iOS action sheet. The `options` object must contain one or more
+   * of:
+   *
+   * - `options` (array of strings) - a list of button titles (required)
+   * - `cancelButtonIndex` (int) - index of cancel button in `options`
+   * - `destructiveButtonIndex` (int) - index of destructive button in `options`
+   * - `title` (string) - a title to show above the action sheet
+   * - `message` (string) - a message to show below the title
+   */
   showActionSheetWithOptions(options: Object, callback: Function) {
     invariant(
       typeof options === 'object' && options !== null,
-      'Options must a valid object'
+      'Options must be a valid object'
     );
     invariant(
       typeof callback === 'function',
@@ -50,7 +60,7 @@ var ActionSheetIOS = {
   ) {
     invariant(
       typeof options === 'object' && options !== null,
-      'Options must a valid object'
+      'Options must be a valid object'
     );
     invariant(
       typeof failureCallback === 'function',
diff --git a/Libraries/ActionSheetIOS/RCTActionSheetManager.m b/Libraries/ActionSheetIOS/RCTActionSheetManager.m
index 18fc8596b115b5..f1eba5c0e410a5 100644
--- a/Libraries/ActionSheetIOS/RCTActionSheetManager.m
+++ b/Libraries/ActionSheetIOS/RCTActionSheetManager.m
@@ -61,6 +61,7 @@ - (CGRect)sourceRectInView:(UIView *)sourceView
   }
 
   NSString *title = [RCTConvert NSString:options[@"title"]];
+  NSString *message = [RCTConvert NSString:options[@"message"]];
   NSArray<NSString *> *buttons = [RCTConvert NSStringArray:options[@"options"]];
   NSInteger destructiveButtonIndex = options[@"destructiveButtonIndex"] ? [RCTConvert NSInteger:options[@"destructiveButtonIndex"]] : -1;
   NSInteger cancelButtonIndex = options[@"cancelButtonIndex"] ? [RCTConvert NSInteger:options[@"cancelButtonIndex"]] : -1;
@@ -113,7 +114,7 @@ - (CGRect)sourceRectInView:(UIView *)sourceView
   {
     UIAlertController *alertController =
     [UIAlertController alertControllerWithTitle:title
-                                        message:nil
+                                        message:message
                                  preferredStyle:UIAlertControllerStyleActionSheet];
 
     NSInteger index = 0;