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diff --git a/compiler/rustc_error_codes/src/error_codes/E0310.md b/compiler/rustc_error_codes/src/error_codes/E0310.md
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+A parameter type is missing a lifetime constraint or has a lifetime that
+does not live long enough.
+
+Erroneous code example:
+
+```compile_fail,E0310
+// This won't compile because T is not constrained to the static lifetime
+// the reference needs
+struct Foo<T> {
+    foo: &'static T
+}
+```
+
+Type parameters in type definitions have lifetimes associated with them that
+represent how long the data stored within them is guaranteed to live. This
+lifetime must be as long as the data needs to be alive, and missing the
+constraint that denotes this will cause this error.
+
+This will compile, because it has the constraint on the type parameter:
+
+```
+struct Foo<T: 'static> {
+    foo: &'static T
+}
+```