diff --git a/design/mvp/Explainer.md b/design/mvp/Explainer.md
index d8c0bdd1..312e3c26 100644
--- a/design/mvp/Explainer.md
+++ b/design/mvp/Explainer.md
@@ -2557,6 +2557,7 @@ interfaceversion  ::= '@' <valid semver>
 canonversion      ::= [1-9] [0-9]* 🔗
                     | '0.' [1-9] [0-9]* 🔗
                     | '0.0.' [1-9] [0-9]* 🔗
+                    | '0.0.0' 🔗
 semversuffix      ::= [0-9A-Za-z.+-]* 🔗
 depname           ::= 'unlocked-dep=<' <pkgnamequery> '>'
                     | 'locked-dep=<' <pkgname> '>' ( ',' <hashname> )?