diff --git a/_style/declarations.md b/_style/declarations.md
index dea8ee8f47..f039b56595 100644
--- a/_style/declarations.md
+++ b/_style/declarations.md
@@ -207,7 +207,7 @@ There are three main reasons you should do this:
     type inferencer can allow a simpler syntax when invoking the
     remaining parameter lists. Consider fold:
 
-        def foldLeft[B](z: B)(op: (A,B) => B): B
+        def foldLeft[B](z: B)(op: (B, A) => B): B
         List("").foldLeft(0)(_ + _.length)
 
         // If, instead: