diff --git a/src/librustc/diagnostics.rs b/src/librustc/diagnostics.rs
index 879a2d740cb..768f792d269 100644
--- a/src/librustc/diagnostics.rs
+++ b/src/librustc/diagnostics.rs
@@ -766,6 +766,9 @@ Example:
 ```
 type X = u32; // this compiles
 ```
+
+Note that type parameters for enum-variant constructors go after the variant,
+not after the enum (Option::None::<u32>, not Option::<u32>::None).
 "##,
 
 E0110: r##"