diff --git a/crates/reporting/src/error/parse.rs b/crates/reporting/src/error/parse.rs
index 2b4f33caf3..8da55ccc68 100644
--- a/crates/reporting/src/error/parse.rs
+++ b/crates/reporting/src/error/parse.rs
@@ -279,8 +279,8 @@ fn to_expr_report<'a>(
                                 alloc.reflow("The arrow "),
                                 alloc.parser_suggestion("->"),
                                 alloc.reflow(" is only used to define cases in a "),
-                                alloc.keyword("when"),
-                                alloc.reflow("."),
+                                alloc.keyword("`when`"),
+                                alloc.reflow("expression:"),
                             ]),
                             alloc
                                 .vcat(vec![
@@ -289,6 +289,13 @@ fn to_expr_report<'a>(
                                     alloc.text("Green -> \"go!\"").indent(4),
                                 ])
                                 .indent(4),
+                            alloc.reflow("And to define a function:"),
+                            alloc
+                                .vcat(vec![
+                                    alloc.text("increment : I64 -> I64"),
+                                    alloc.text("increment = \\n -> n + 1"),
+                                ])
+                                .indent(4),
                         ])]
                     }
                 },
diff --git a/crates/reporting/tests/test_reporting.rs b/crates/reporting/tests/test_reporting.rs
index da3db9af29..452b009380 100644
--- a/crates/reporting/tests/test_reporting.rs
+++ b/crates/reporting/tests/test_reporting.rs
@@ -5645,11 +5645,17 @@ All branches in an `if` must have the same type!
     5│          1 -> True
                   ^^
 
-    The arrow -> is only used to define cases in a `when`.
+    The arrow -> is used to define cases in a `when` expression:
 
         when color is
             Red -> "stop!"
             Green -> "go!"
+
+    And to define a function:
+
+        increment : I64 -> I64
+        increment = \n -> n + 1
+
     "###
     );