diff --git a/CHANGELOG.md b/CHANGELOG.md
index bee63cb..f3e25a0 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 connectivity (HNO3) from GMI to GOCART
+
 ### Removed
 ### Changed
 ### Fixed
diff --git a/GEOS_ChemGridComp.F90 b/GEOS_ChemGridComp.F90
index b1cb31e..6073992 100644
--- a/GEOS_ChemGridComp.F90
+++ b/GEOS_ChemGridComp.F90
@@ -787,8 +787,8 @@ subroutine SetServices ( GC, RC )
     !  ... For GOCART::SU,NI
     !  ---------------------
     CALL MAPL_AddConnectivity ( GC, &
-         SRC_NAME  = (/ "OH  ", "H2O2", "NO3 " /), &
-         DST_NAME  = (/ "GMI_OH  ", "GMI_H2O2", "GMI_NO3 " /), &
+         SRC_NAME  = (/ "OH  ", "H2O2", "NO3 ", "HNO3" /), &
+         DST_NAME  = (/ "GMI_OH  ", "GMI_H2O2", "GMI_NO3 ", "GMI_HNO3" /), &
          DST_ID=GOCART2G, SRC_ID=GMICHEM, __RC__)
 
    END IF