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diff --git a/manual/errno.texi b/manual/errno.texi
index 09c6ac68cf..8f752b39ec 100644
--- a/manual/errno.texi
+++ b/manual/errno.texi
@@ -869,6 +869,8 @@ up, before it has connected to the file.
@deftypevr Macro int ED
@comment errno 102 @c DO NOT REMOVE
The experienced user will know what is wrong.
+@c This error code is a joke. Its perror text is part of the joke.
+@c Don't change it.
@end deftypevr
@comment errno.h