diff --git a/.gitignore b/.gitignore
index ec766ae..f8538f6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,9 @@ GEOSCHEMchem_GridComp/geos-chem@
 /@GOCART/
 /GOCART/
 /GOCART@/
+/@Aerosol_ExtData/
+/Aerosol_ExtData/
+/Aerosol_ExtData@/
 /@QuickChem/
 /QuickChem/
 /QuickChem@/
diff --git a/CHANGELOG.md b/CHANGELOG.md
index bee63cb..82e97d0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 ### Added
+
+- Added CMake for new `GOCART2G_ExtData` subrepo
+
 ### Removed
 ### Changed
 ### Fixed
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 17c88ed..6173a7a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 esma_set_this ()
 
-esma_add_subdirectories(Shared GOCART TR GMI StratChem MAM MATRIX CARMA GAAS ACHEM)
+esma_add_subdirectories(Shared GOCART TR GMI StratChem MAM MATRIX CARMA GAAS ACHEM Aerosol_ExtData)
 
 set (alldirs
   GEOSpchem_GridComp
@@ -16,7 +16,7 @@ set (srcs
   GEOS_ChemEnvGridComp.F90
   )
 
-# Note: GOCART_GridComp is added specifically as it is not longer
+# Note: GOCART_GridComp is added specifically as it is no longer
 #       automatically a dependence through alldirs
 esma_add_library (${this}
   SRCS ${srcs}