faq.md
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@@ -9,7 +9,12 @@ BioGrids software titles all have a version number associated with them. Most ti
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## How do I set the version to use?
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-Every title has a default version. You can change the version in use by using the version override environment variable for the title. Details here: [Overriding Software Versions](https://biogrids.org/wiki/versions)
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+Every title has a default version. You can change the version in use by using the version override environment variable for the title.
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+On Linux: export SAMTOOLS_X=1.9
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+On Mac: export SAMTOOLS_X=1.9
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+Details here: [Overriding Software Versions](https://biogrids.org/wiki/versions)
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## R version confirmation
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