diff --git a/README.md b/README.md
index c0d35ea..833b919 100644
--- a/README.md
+++ b/README.md
@@ -128,7 +128,7 @@ execution if an immediate value was returned),
 the mutex is released. `runExclusive` returns a promise that adopts the state of the function result.
 
 The mutex is released and the result rejected if an exception occurs during execution
-if the callback.
+of the callback.
 
 ### Manual locking / releasing