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diff --git a/doc/crypto/OPENSSL_instrument_bus.pod b/doc/crypto/OPENSSL_instrument_bus.pod
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-=pod
-
-=head1 NAME
-
-OPENSSL_instrument_bus, OPENSSL_instrument_bus2 - instrument references to memory bus
-
-=head1 SYNOPSIS
-
- #ifdef OPENSSL_CPUID_OBJ
- size_t OPENSSL_instrument_bus (int *vector,size_t num);
- size_t OPENSSL_instrument_bus2(int *vector,size_t num,size_t max);
- #endif
-
-=head1 DESCRIPTION
-
-It was empirically found that timings of references to primary memory
-are subject to irregular, apparently non-deterministic variations. The
-subroutines in question instrument these references for purposes of
-gathering entropy for random number generator. In order to make it
-bus-bound a 'flush cache line' instruction is used between probes. In
-addition probes are added to B<vector> elements in atomic or
-interlocked manner, which should contribute additional noise on
-multi-processor systems. This also means that B<vector[num]> should be
-zeroed upon invocation (if you want to retrieve actual probe values).
-
-OPENSSL_instrument_bus performs B<num> probes and records the number of
-oscillator cycles every probe took.
-
-OPENSSL_instrument_bus2 on the other hand B<accumulates> consecutive
-probes with the same value, i.e. in a way it records duration of
-periods when probe values appeared deterministic. The subroutine
-performs at most B<max> probes in attempt to fill the B<vector[num]>,
-with B<max> value of 0 meaning "as many as it takes."
-
-=head1 RETURN VALUE
-
-Return value of 0 indicates that CPU is not capable of performing the
-benchmark, either because oscillator counter or 'flush cache line' is
-not available on current platform. For reference, on x86 'flush cache
-line' was introduced with the SSE2 extensions.
-
-Otherwise number of recorded values is returned.