diff --git a/docs/source/usersguide/input.rst b/docs/source/usersguide/input.rst index 4d96506ec0..c834bbc92e 100644 --- a/docs/source/usersguide/input.rst +++ b/docs/source/usersguide/input.rst @@ -1035,10 +1035,10 @@ The ```` element accepts the following sub-elements: *Default*: total :estimator: - The estimator element is used to force the us eof either ``analog`` or + The estimator element is used to force the use of either ``analog`` or ``tracklength`` tally estimation. ''analog'' is generally less efficient though it can be used with every score type. ''tracklength'' is generally - the most efficient, though its usage is restricted to tallies which do not + the most efficient, though its usage is restricted to tallies that do not score particle information which requires a collision to have occured, such as a scattering tally which utilizes outgoing energy filters.