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diff --git a/docs/development/design/ndrpdr.rst b/docs/development/design/ndrpdr.rst
index f748476..4f611a0 100644
--- a/docs/development/design/ndrpdr.rst
+++ b/docs/development/design/ndrpdr.rst
@@ -23,7 +23,12 @@ Call chain for calculating the NDR-PDR for a list of frame sizes:
 
 The search range is delimited by a left and right rate (expressed as a % of line rate per direction).
 
+The load_epsilon configuration parameter defines the accuracy of the result as a % of line rate.
+The default value of 0.1 indicates for example that the measured NDR and PDR are within 0.1% of line rate of the
+actual NDR/PDR (e.g. 0.1% of 10Gbps is 10Mbps). It also determines how small the search range must be in the binary search.
+
 The recursion narrows down the range by half and stops when:
 - the range is smaller than the configured load_epsilon value
 - or when the search hits 100% or 0% of line rate
 
+