diff --git a/docs/superpowers/specs/2026-03-24-login-dialog-design.md b/docs/superpowers/specs/2026-03-24-login-dialog-design.md
index 6191d6a..dd48753 100644
--- a/docs/superpowers/specs/2026-03-24-login-dialog-design.md
+++ b/docs/superpowers/specs/2026-03-24-login-dialog-design.md
@@ -21,7 +21,7 @@ interface LoginFormProps {
   logo?: ReactNode
   title?: string                      // Default: "Sign in"
   socialProviders?: SocialProvider[]   // Omit or [] to hide social section + divider
-  onSubmit: (credentials: { email: string; password: string; remember: boolean }) => void
+  onSubmit?: (credentials: { email: string; password: string; remember: boolean }) => void  // Omit to hide credentials section
   onForgotPassword?: () => void       // Omit to hide link
   onSignUp?: () => void               // Omit to hide "Don't have an account?"
   error?: string                      // Server-side error, rendered as Alert
@@ -62,9 +62,9 @@ Social-first ordering, top to bottom:
 
 The form adapts automatically based on props:
 
-- **Full** — social providers + credentials + all links
-- **Credentials only** — no `socialProviders` passed, social section and divider hidden
-- **Social only** — only `socialProviders` passed, credentials section hidden (make `onSubmit` optional for this case, or accept it will never fire)
+- **Full** — `socialProviders` + `onSubmit` both provided. Social buttons, divider, and credentials all shown.
+- **Credentials only** — `onSubmit` provided, no `socialProviders`. Social section and divider hidden.
+- **Social only** — `socialProviders` provided, `onSubmit` omitted. Credentials section (email, password, remember me, submit button) and divider hidden.
 
 ## Validation