diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9955add4..65f5d40e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,7 +1,7 @@
 image: continuumio/miniconda3:latest
 
 before_script:
-- pip install jupyter-book sphinxcontrib_bibtex==1.0.0
+- pip install jupyter-book==0.10.1 sphinxcontrib_bibtex==1.0.0
 
 pages:
   stage: deploy
diff --git a/infrastructure-guide/repo00.md b/infrastructure-guide/repo00.md
index 081eff0f..5d0b39ca 100644
--- a/infrastructure-guide/repo00.md
+++ b/infrastructure-guide/repo00.md
@@ -34,9 +34,9 @@ The iso images in `/var/www/html/iso` then (automatically) mounted as loop devic
 ```
 
 
-The `pli-repo-mirror.timer` runs a daily sync, which pulls the repos into `/var/www/html/el7/sources` . The name is misleading, these are actually all the latest repos.
+The `pli-repo-mirror.timer` runs a daily sync (at 21:30), which pulls the repos into `/var/www/html/el7/sources` . The name is misleading, these are actually all the latest repos.
 
-From the above, a weekly snapshot is taken by the `pli-repo-snapshot.timer`.
+From the above, a weekly snapshot (at Sun 23:30) is taken by the `pli-repo-snapshot.timer`.
 
 The `/opt/pli/libexec/pli-repo-zoom.sh` is run via the `pli-repo-zoom.timer` timer, it maintains the zoom repo at /var/www/html/zoom/