diff --git a/.azure-pipelines/main.yml b/.azure-pipelines/main.yml
index c08cfea56..c82647bd8 100644
--- a/.azure-pipelines/main.yml
+++ b/.azure-pipelines/main.yml
@@ -7,6 +7,11 @@ pr:
   - '*.x'
 
 variables:
+  # We set this here to avoid coverage data being uploaded from things like our
+  # nightly pipeline. This is done because codecov (helpfully) keeps track of
+  # the number of coverage uploads for a commit and displays a warning when
+  # comparing two commits with an unequal number of uploads. Only uploading
+  # coverage here should keep the number of uploads it sees consistent.
   uploadCoverage: true
 
 jobs: