diff --git a/doc/release-process.md b/doc/release-process.md
index eed18ad47..93eab0ffb 100644
--- a/doc/release-process.md
+++ b/doc/release-process.md
@@ -98,6 +98,10 @@ The output should include something like, which is created by Homu:
 
     Auto merge of #4242 - nathan-at-least:release-v1.0.9, r=nathan-at-least
 
+If you haven't previously done so, set the gpg key id you intend to use for signing:
+
+    git config --global user.signingkey <keyid>
+
 Then create the git tag. The `-s` means the release tag will be
 signed. **CAUTION:** Remember the `v` at the beginning here: