SetupConda.md

@@ -69,3 +69,15 @@ activate with
 ```
 conda activate cds-py37
 ```
+
+Enjoy!
+
+## Updating an environment
+
+Updating an environment is almost the same
+
+```
+conda env create --file https://apt.ligo-wa.caltech.edu/sources/conda/environments/linux-64/cds-py37.yaml --prune
+```
+
+```--prune``` removes packages not needed after the update.
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