diff --git a/docs/configuration.md b/docs/configuration.md
index 10b7b2c282..0e7a089d07 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -111,7 +111,7 @@ These values can be overridden globally or per-build (or both).
 
 ```yaml
 env:
-- FOO=foo 
+- FOO=foo
 builds:
 - id: foo
   dir: .