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diff --git a/compiler/rustc_error_codes/src/error_codes/E0308.md b/compiler/rustc_error_codes/src/error_codes/E0308.md
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+Expected type did not match the received type.
+
+Erroneous code examples:
+
+```compile_fail,E0308
+fn plus_one(x: i32) -> i32 {
+    x + 1
+}
+
+plus_one("Not a number");
+//       ^^^^^^^^^^^^^^ expected `i32`, found `&str`
+
+if "Not a bool" {
+// ^^^^^^^^^^^^ expected `bool`, found `&str`
+}
+
+let x: f32 = "Not a float";
+//     ---   ^^^^^^^^^^^^^ expected `f32`, found `&str`
+//     |
+//     expected due to this
+```
+
+This error occurs when an expression was used in a place where the compiler
+expected an expression of a different type. It can occur in several cases, the
+most common being when calling a function and passing an argument which has a
+different type than the matching type in the function declaration.