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diff --git a/INSTALL.md b/INSTALL.md
index 2e1c778..71c1c01 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -1,3 +1,15 @@
+# Python ecosystem
+
+If you feel like running arbitrary code downloaded over the
+internet (pypi doesn't support gpg signatures [anymore](https://github.com/pypa/python-packaging-user-guide/pull/466)),
+mat2 is [available on pypi](https://pypi.org/project/mat2/), and can be
+installed like this:
+
+```
+pip3 install mat2
+```
+
+
 # GNU/Linux
 
 ## Fedora