diff --git a/examples/environment-variables/environment-variables.sh b/examples/environment-variables/environment-variables.sh
index 8b4cc1f..0d0becf 100644
--- a/examples/environment-variables/environment-variables.sh
+++ b/examples/environment-variables/environment-variables.sh
@@ -1,5 +1,6 @@
 # Running the program shows that we pick up the value
-# value for `FOO` that we set in the program.
+# value for `FOO` that we set in the program, but that
+# `BAR` is empty.
 $ go run environment-variables.go
 FOO: 1
 BAR: