diff --git a/docs/advanced/input-unions.md b/docs/advanced/input-unions.md
index 0450cf1..0220316 100644
--- a/docs/advanced/input-unions.md
+++ b/docs/advanced/input-unions.md
@@ -171,4 +171,4 @@ The `ValueOrDefault()` method will return a type of the fallback value, NOT of t
 
 
 ## Support
-Input Unions are supported in *GraphQL ASP.NET version 1.6* or later
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+Input Unions are supported in *GraphQL ASP.NET version 1.5* or later
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