diff --git a/doc/ReleaseNotes/develop.tex b/doc/ReleaseNotes/develop.tex
index c3b6c4e497e..718b9befd5a 100644
--- a/doc/ReleaseNotes/develop.tex
+++ b/doc/ReleaseNotes/develop.tex
@@ -6,15 +6,15 @@
 	\underline{NEW FUNCTIONALITY}
 	\begin{itemize}
 		\item A new adaptive time stepping (ATS) capability was added to the Advection (ADV) Package of the Groundwater Transport (GWT) Model.  A new input option, called ATS\_PERCEL, specifies the fractional cell distance that a particle of water can travel within one time step.  When ATS\_PERCEL is specified by the user, and the ATS utility is activated in the TDIS Package, the ADV Package will calculate the largest time step that will meet this fractional cell distance constraint, and will submit this time step to the ATS utility.  This option may improve time stepping for solute transport models and for variable-density flow and transport models by allowing step lengths to be calculated as a function of the flow system rather than being specified as input by the user.
-		\item Added the capability to write sorbate concentrations to a binary output file.  A new SORBATE option is now available in the Mass Storage and Transfer (MST) Package of the GWT Model to provide the name of the binary output file for sorbate concentrations. Sorbate concentrations will be written to the binary output file whenever concentrations for the GWT model are saved, as determined by the GWT Output Control option.
+		\item Added the capability to write sorbate concentrations to binary output files.  A new SORBATE option is now available in the Mobile Storage and Transfer (MST) Package and the Immobile Storage and Transfer (IST) Package of the GWT Model to provide the name of the binary output file for sorbate concentrations. Sorbate concentrations will be written to the binary output file whenever concentrations for the GWT model are saved, as determined by the GWT Output Control option.
 		\item Add kinematic-wave routing option for the Streamflow Routing (SFR) Package. Prior to this change, the SFR Package could only simulate unidirectional, steady, uniform flow. With kinematic-wave routing, unidirectional waves can now propagate through the SFR network by explicitly including a storage term in the reach continuity equation. The kinematic-wave routing option is based on the ``TRANSROUTE'' option available in the SFR Package in MODFLOW-NWT. The kinematic-wave routing option is enabled by specifying ``STORAGE'' in the SFR Package OPTIONS block.
-		%	\item xxx
+		\item The Freundlich and Langmuir isotherms can now be used to represent sorption in the immobile domain when simulating solute transport using the Groundwater Transport (GWT) Model.  Prior to this change, only linear sorption could be used with the Immobile Storage and Transfer (IST) Package for the GWT Model.  With this change, the SORPTION keyword specified in the OPTIONS block of the IST Package must be followed by LINEAR, FREUNDLICH, or LANGMUIR.  If the FREUNDLICH or LANGMUIR isotherms are specified, then the user must also include the SP2 array in the GRIDDATA block of the IST Package.  This change breaks backward compatibility for GWT Models that used the SORPTION option in the IST Package, which previously did not require the type of sorption to be specified after the SORPTION keyword.  Details on the implementation of the nonlinear Freundlich and Langmuir sorption isotherms are described in a new chapter in the MODFLOW 6 --- Supplemental Technical Information guide, which is included with the MODFLOW 6 distribution.
 	\end{itemize}
 
 	\underline{EXAMPLES}
 	\begin{itemize}
 		\item A new Toth example was added to show how the classic groundwater problem consisting of local, intermediate, and regional flow paths can be simulated with MODFLOW.
-	%	\item xxx
+		\item A new Barends example was added to demonstrate the use of the Groundwater Energy (GWE) Model for simulating heat transport in a groundwater reservoir overlain by a low-permeability overburden.
 	%	\item xxx
 	\end{itemize}
 
diff --git a/doc/ReleaseNotes/previous/v6.2.1.tex b/doc/ReleaseNotes/previous/v6.2.1.tex
index e9fb9ac0350..ca914259ab6 100644
--- a/doc/ReleaseNotes/previous/v6.2.1.tex
+++ b/doc/ReleaseNotes/previous/v6.2.1.tex
@@ -27,7 +27,7 @@
 	        \item Budget terms for the Immobile domain Storage and Transfer (IST) Package were not being written to the binary budget file for the GWT Model.  The package was modified to write these rate terms to the GWT binary budget file using the settings specified in the GWT Output Control file.
 	        \item Bulk density does not need to be specified for the Immobile domain Storage and Transfer (IST) Package if sorption is not active; however the program was trying to access bulk density even though it is not needed, which resulted in an access violation.  Program was fixed so that bulk density does not need to be specified by the user unless sorption is active for the IST Package.
 	        \item Budget tables printed to the listing file had numeric values that were missing the `E` character if the exponent had three digits (e.g. 1.e-100 or 1.e100).  Writing of the budget table was modified to include the `E` character in this case.  This change should make it easier for programs written in other languages to parse these tables.
-	        \item In the Mass Transfer and Storage (MST) and the Immobile Storage and Transfer (IST) Packages, the keyword to activate sorption was changed from SORBTION to SORPTION.  The program will still accept SORBTION, but this keyword will be deprecated in the future.
+	        \item In the Mobile Transfer and Storage (MST) and the Immobile Storage and Transfer (IST) Packages, the keyword to activate sorption was changed from SORBTION to SORPTION.  The program will still accept SORBTION, but this keyword will be deprecated in the future.
 	        \item Revised several of the text strings written to the headers within the GWT binary budget file.  A table of possible text strings for the GWT binary budget file are now included in the mf6io.pdf document.
 	\end{itemize}