Update CHANGELOG.md

CHANGELOG.md

@@ -6,21 +6,23 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [PEP 440](https://www.python.org/dev/peps/pep-0440/)
 and uses [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+
 ## [1.1.0]
 
 ### Added
 - The [hydrosar.ipynb](notebooks/hydrosar.ipynb) provides a walkthrough of generating HYDRO30 products from RTC30 products locally using the `hydrosar` package 
 - The [hydrosar-on-demand.ipynb](notebooks/hydrosar-on-demand.ipynb) provides a walkthrough of requesting the RTC30 and HYDRO30 products from the <https://hyp3-watermap.asf.alaska.edu/> deployment
 - [OSL_README.md](docs/OSL_README.md) describing how to setup a development environment in ASF's OpenScienceLab.
 
-### Removed
-- The `water-extent-map.ipynb` and the `water-extent-map-on-demand.ipynb` notebooks carried over `asf_tools`.
-
-## [1.0.1]
+### Changed
+- When calculating the perennial water threshold, using 0.68 of the reverse CDF (1-sigma) instead of 0.95 (2-sigma) provides more reasonable results.
 
 ### Fixed
 - `asf_tools>=0.6` dependency is now correctly specified in the `pyproject.toml`
 
+### Removed
+- The `water-extent-map.ipynb` and the `water-extent-map-on-demand.ipynb` notebooks carried over `asf_tools`.
+
 ## [1.0.0]
 
 ### Added