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diff --git a/README.md b/README.md
index 5af2e03..37d950a 100644
--- a/README.md
+++ b/README.md
@@ -136,6 +136,7 @@ Barb can include environment variable values and variables defined in `.env` int
 
 ```
 {VARIABLE NAME}
+{VARIABLE NAME:-DEFAULT}
 ```
 
 This allows to do the following: