diff --git a/CHANGELOG.md b/CHANGELOG.md
index 549205e5b9..efa772017f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -39,6 +39,7 @@ release.
 - Updated download location for Dawn source files to include updated pck from HAMO Dawn mosaic [#4001](https://github.com/USGS-Astrogeology/ISIS3/issues/4001)
 - Pinned cspice version to 67 [#5083](https://github.com/USGS-Astrogeology/ISIS3/issues/5083) 
 - Changed the `rsync` related commands in the ISIS SPICE Web Service document to `downloadIsisData` command
+- Updated documentation for `tgocassisrdrgen` to be more descriptive and accurate.
 - Updated Geos from version 3.7 to 3.9 [#3627](https://github.com/DOI-USGS/ISIS3/issues/3627)
 
 ### Added
diff --git a/isis/src/tgo/apps/tgocassisrdrgen/tgocassisrdrgen.xml b/isis/src/tgo/apps/tgocassisrdrgen/tgocassisrdrgen.xml
index a1bf9a72cf..43d6146110 100644
--- a/isis/src/tgo/apps/tgocassisrdrgen/tgocassisrdrgen.xml
+++ b/isis/src/tgo/apps/tgocassisrdrgen/tgocassisrdrgen.xml
@@ -6,7 +6,9 @@
   </brief>
 
   <description>
-    SOMETHING
+    "Tgocassisrdrgen" is an app that converts CaSSIS cubes, which are 3D images
+    captured by the CaSSIS camera on board the European Space Agency's ExoMars
+    Trace Gas Orbiter, into PDS 4 standard format.
   </description>
 
   <history>