Merge pull request #138 from derekparker/fix-typo
readme: Fix typo
diff --git a/README.md b/README.md
index f86abfd..9fa1933 100644
--- a/README.md
+++ b/README.md
@@ -58,7 +58,7 @@
### Establishing Defaults
A good configuration system will support default values. A default value is not
-required for a key, but it's useful in the event that a key hasn’t be set via
+required for a key, but it's useful in the event that a key hasn’t been set via
config file, environment variable, remote configuration or flag.
Examples:
