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diff --git a/manual/install.texi b/manual/install.texi
index c775005..6d43599 100644
--- a/manual/install.texi
+++ b/manual/install.texi
@@ -144,6 +144,15 @@ dynamic linker diagnostics to run on CPUs which are not compatible with
the rest of @theglibc{}, for example, due to compiler flags which target
a later instruction set architecture (ISA).
+@item --with-extra-version-id=@var{string}
+Use @var{string} as part of the fingerprint that is used by the dynamic
+linker to detect an incompatible version of @file{libc.so}. For
+example, @var{string} could be the full package version and release
+string used by a distribution build of @theglibc{}. This way,
+concurrent process creation during a package update will fail with an
+error message, @emph{ld.so/libc.so mismatch detected (upgrade in
+progress?)}, rather than crashing mysteriously.
+
@item --with-timeoutfactor=@var{NUM}
Specify an integer @var{NUM} to scale the timeout of test programs.
This factor can be changed at run time using @env{TIMEOUTFACTOR}