diff --git a/docs/alice.md b/docs/alice.md
index afc1342..35d1799 100644
--- a/docs/alice.md
+++ b/docs/alice.md
@@ -13,6 +13,8 @@ module load Nextflow/21.03.0
 module load Java/11.0.2
 ```
 
+We also highly recommend specifying a location of a cache directory to store singularity images (so you re-use them across runs, and not pull each time), by specifying the location with the `$NXF_SINGULARITY_CACHE_DIR` bash environment variable  in your `.bash_profile` or `.bashrc`.
+
 All of the intermediate files required to run the pipeline will be stored in the `work/` directory. It is recommended to delete this directory after the pipeline has finished successfully because it can get quite large, and all of the main output files will be saved in the `results/` directory anyway.
 The config contains a `cleanup` command that removes the `work/` directory automatically once the pipeline has completeed successfully. If the run does not complete successfully then the `work/` dir should be removed manually to save storage space.