diff --git a/.dockerignore b/.dockerignore
index 5b2701b..ae9975f 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,6 +1,9 @@
 # .git is sent so that `make build` in the Dockerfile can stamp the commit into
 # upaas. List no tracked file here: git would see it as deleted in the build and
 # the version would end in -dirty.
+# .git is sent without its config, because a remote URL there can carry a
+# credential; `git describe` does not need it.
+.git/config
 .env
 bin/
 .vscode/
diff --git a/TODO.md b/TODO.md
index bf60f7f..4095a92 100644
--- a/TODO.md
+++ b/TODO.md
@@ -20,6 +20,10 @@ regress.
 
 # Completed Steps
 
+- 2026-10-02: `.dockerignore` leaves out `.git/config`, so a remote URL there
+  that carries a credential no longer goes into the Docker build; the image
+  still shows the commit it was built from (#269).
+
 - 2026-10-01: Built images are tagged `upaas-<app>:<short hash>`, git's short
   form of the commit built, instead of the deployment number. A redeploy of a
   commit gives its tag to the new image; the old one is kept while the app runs