diff --git a/share/completions/delta.fish b/share/completions/delta.fish
index b90e2dba4..46c3f4098 100644
--- a/share/completions/delta.fish
+++ b/share/completions/delta.fish
@@ -1,2 +1,3 @@
-# Old versions of fish do not have a --generate-completion option!
+# Older versions of delta do not have a --generate-completion option and will complain
+# to stderr but emit nothing to stdout, making it safe (but a no-op) to source.
 delta --generate-completion fish 2>/dev/null | source