diff --git a/collects/planet2/scribblings/planet2.scrbl b/collects/planet2/scribblings/planet2.scrbl
index 2512bf0315..cc69db236a 100644
--- a/collects/planet2/scribblings/planet2.scrbl
+++ b/collects/planet2/scribblings/planet2.scrbl
@@ -153,14 +153,15 @@ is the directory name.}
 URLs is:
 
 @inset{@exec{github://github.com/}@nonterm{user}@exec{/}@nonterm{repository}@;
-@exec{/}@nonterm{branch}@exec{/}@nonterm{optional-subpath}}
+@exec{/}@nonterm{branch-or-tag}@exec{/}@nonterm{optional-subpath}}
 
 For example, @filepath{github://github.com/game/tic-tac-toe/master/}
 is a GitHub package source.
 
-The @exec{zip}-formatted archive for the repository (generated by GitHub for
-every branch) is used as a remote URL archive path, except the
-@tech{checksum} is the hash identifying the branch. 
+The @exec{zip}-formatted archive for the repository (generated by
+GitHub for every branch and tag) is used as a remote URL archive path,
+except the @tech{checksum} is the hash identifying the branch (or
+tag).
 
 A package source is inferred to be a GitHub reference when it
 starts with @litchar{github://}; a package source that is otherwise