Mention Boost 1.75.0 since it still works with gcc 4.8.5, updated list
of sketches

diff --git a/README.md b/README.md
index e39c843..3cfdbe5 100755
--- a/README.md
+++ b/README.md

@@ -28,15 +28,17 @@
## This extension currently supports the following sketches:
- CPC (Compressed Probabilistic Counting) sketch - very compact (smaller than HLL when serialized) distinct-counting sketch
-- Theta sketch - distinct counting with set operations (union, intersection, a-not-b)
- HLL sketch - very compact distinct-counting sketch based on HyperLogLog algorithm
-- KLL float quantiles sketch - for estimating distributions: quantile, rank, PMF (histogram), CDF
+- Theta sketch - distinct counting with set operations (union, intersection, a-not-b)
+- Array Of Doubles (AOD) sketch - a kind of Tuple sketch with array of double values associated with each key
+- KLL (float and double) quantiles sketch - for estimating distributions: quantile, rank, PMF (histogram), CDF
+- Quantiles sketch (inferior to KLL, for long-term support of data sets)
- Frequent strings sketch - capture the heaviest items (strings) by count or by some other weight
## Building this PostgreSQL Extension Requires 4 Dependencies
* C++11
-* Boost version 1.76.0 we know this works, older and newer may work as well
+* Boost version 1.75.0 we know this works, older and newer may work as well
* PostgreSQL database versions 9.6 and higher
* [DataSketches *C++/Python Core*](https://github.com/apache/datasketches-cpp) version 4.1.0 or later
@@ -93,7 +95,7 @@
From the command line at the PGXN installed root or the root of the C++ PostgreSQL Adaptor run:
* *make*
-* *sudo make install* #sudo may not be required depending on how PSQL was installed
+* *sudo make install* #sudo may not be required depending on how PostgreSQL was installed
NOTE: On MacOSX Mojave, if you see a warning similar to this: