diff --git a/README.md b/README.md
index 93caf5a..90f8f2d 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,15 @@ depends on `7za`, `zcat`, and `bzcat` for those respective formats. On
 Debian or Ubuntu, `apt install 7zip` provides `7za`; the others are
 standard.
 
+Note that `pip install .` copies the source into the environment, so
+rerun it after switching branches or editing the code.
+
+Members of the Community Data Science Collective installing on the klone
+cluster should follow the collective's own instructions instead, since
+the Python environment and its dependencies are set up differently
+there. See [CommunityData:Hyak software
+installation](https://wiki.communitydata.science/CommunityData:Hyak_software_installation).
+
 ## Usage
 
     wikiq dump.xml.7z -o output/