diff --git a/changelogs/fragments/a-g-dl-checksum-mismatch-diag.yml b/changelogs/fragments/a-g-dl-checksum-mismatch-diag.yml
new file mode 100644
index 00000000000..63e5ee2f8c3
--- /dev/null
+++ b/changelogs/fragments/a-g-dl-checksum-mismatch-diag.yml
@@ -0,0 +1,3 @@
+minor_changes:
+- ansible-galaxy - Update the error message in regards to collection download checksum mismatch to include the downloaded size,
+  information about incomplete reads if the ``Content-Length`` differs from the downloaded file size.