README.md in ngt-0.2.4 vs README.md in ngt-0.3.0

@@ -10,10 +10,16 @@
 
 ```ruby
 gem 'ngt'
 ```
 
+On Mac, also install OpenMP:
+
+```sh
+brew install libomp
+```
+
 NGT is not available for Windows
 
 ## Getting Started
 
 Prep your data
@@ -116,10 +122,10 @@
 ```ruby
 Ngt::Index.new(dimensions,
   edge_size_for_creation: 10,
   edge_size_for_search: 40,
   object_type: :float, # :float, :integer
-  distance_type: :l2,  # :l1, :l2, :hamming, :angle, :cosine, or :jaccard
+  distance_type: :l2,  # :l1, :l2, :hamming, :angle, :cosine, :normalized_angle, :normalized_cosine, :jaccard
   path: nil
 )
 ```
 
 ## Optimizer Options