diff --git a/docs/conceptual/seq.unfold['state,'t]-function-[fsharp].md b/docs/conceptual/seq.unfold['state,'t]-function-[fsharp].md
index 798b8e8e..e96e2af8 100644
--- a/docs/conceptual/seq.unfold['state,'t]-function-[fsharp].md
+++ b/docs/conceptual/seq.unfold['state,'t]-function-[fsharp].md
@@ -32,7 +32,7 @@ Seq.unfold generator state
 
 #### Parameters
 *generator*
-Type: **'State -> 'T * 'State option**
+Type: **'State -> ('T * 'State) option**
 
 
 A function that takes the current state and returns an option tuple of the next element of the sequence and the next state value.