From 15c8c569ef9eaabe4460d204b8af70ccf5cbe6a5 Mon Sep 17 00:00:00 2001
From: Dan Allan <dallan@bnl.gov>
Date: Tue, 11 Aug 2020 16:40:05 -0400
Subject: [PATCH] Add comment explaining jsonschema 2 build in Travis config.

---
 .travis.yml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/.travis.yml b/.travis.yml
index 57bd03c6..18dca46c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,11 @@ matrix:
     - python: 3.7
       env: PUBLISH_DOCS=1
     - python: 3.7
+      # We still test against jsonschema 2.x because pip's dependency resolver
+      # very often gives us 2.x even though we ask for 3.x. The event-model
+      # code has codepaths for either, conditional on what is installed.
+      # See https://github.com/bluesky/event-model/pull/175 and
+      # https://github.com/bluesky/event-model/issues/145 for more context.
       env: JSONSCHEMA_2=1
     - python: 3.8
     - python: nightly