diff --git a/Definition-format.md b/Definition-format.md
index c0ecafd..945a51e 100644
--- a/Definition-format.md
+++ b/Definition-format.md
@@ -910,7 +910,7 @@ search:
 
 The implementation is based on: <https://golang.org/pkg/text/template/#hdr-Functions>
 These are not true logical OR and AND operators in that they operate on variables that contain a value or are empty.
-The use if round brackets is entirely optional.
+The use of round brackets is entirely optional.
 
 Example of: if or ... else ... end