diff --git a/gridded_glm/PACKAGE_README.md b/gridded_glm/PACKAGE_README.md
index c04e3534941e05fc15aa6e571f9ccc3dfe096a21..98db29de7c9c4b2e606e2437f945df413773fb4d 100644
--- a/gridded_glm/PACKAGE_README.md
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@@ -1,3 +1,21 @@
 # CSPP Geo Gridded GLM
 
-TODO
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+USAGE
+
+The following scripts are located in the `bin/` directory.
+
+cspp-geo-gglm-trio-picker.sh
+
+A simple wrapper around cspp-geo-gglm-minute-gridder.sh that takes a single input file and:
+1) determines if it is the last file in a minute
+2) if so, finds all files from that minute and passes them to cspp-geo-gglm-minute-gridder.sh
+3) creates both grids and tiles for that minute
+
+cspp-geo-gglm-minute-gridder.sh
+
+This script creates one minute grids from any number of input files.
+
+
+cspp-geo-gglm-make-grids.sh
+
+A wrapper for the `make_GLM_grids.py` "kitchen sink" example script provided by glmtools.
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