diff --git a/index.html b/index.html
index e5050bb4..43eba2c6 100644
--- a/index.html
+++ b/index.html
@@ -737,7 +737,7 @@ <h2 id="generic-did-syntax">Generic DID Syntax</h2>
   did                = "did:" method-name ":" method-specific-id
   method-name        = 1*method-char
   method-char        = %x61-7A / DIGIT
-  method-specific-id = *idchar *( ":" *idchar )
+  method-specific-id = *( ":" *idchar ) 1*idchar
   idchar             = ALPHA / DIGIT / "." / "-" / "_"
         </pre>