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-rw-r--r--Doc/Zsh/builtins.yo4
1 files changed, 3 insertions, 1 deletions
diff --git a/Doc/Zsh/builtins.yo b/Doc/Zsh/builtins.yo
index fbea91ee2..a65af889e 100644
--- a/Doc/Zsh/builtins.yo
+++ b/Doc/Zsh/builtins.yo
@@ -1192,7 +1192,9 @@ Convert the result to lower case whenever the parameter is expanded.
 The value is em(not) converted when assigned.
 )
 item(tt(-r))(
-The given var(name)s are marked readonly.
+The given var(name)s are marked readonly.  Note that if var(name) is a
+special parameter, the readonly attribute can be turned on, but cannot then
+be turned off.
 )
 item(tt(-t))(
 Tags the named parameters.  Tags have no special meaning to the shell.