Improved documentation.

Author: dreibh

README.md

@@ -280,7 +280,7 @@ NetPerfMeter supports randomised frame rate and frame size, to create variable b
 * exp<p>: Exponential distribution with mean <mean>. Example: exp1000.
 * pareto<location>,<shape>: Pareto distribution with location <location> and shape <shape>. Example: pareto0.166667,1.5.
 * normal<mean>,<stddev>: Normal distribution with mean <mean> and standard deviation <stddev>. Example: normal1000,500.
-Note that normal distribution may result in negative values, which may be ignored (frame size) or interpreted as saturated traffic (frame rate).
+Note that normal distribution may result in negative values, which may be ignored (frame size) or interpreted as saturated traffic (frame rate). Use truncnormal to prevent negative values.
 * truncnormal<mean>,<stddev>: Truncated normal distribution with mean <mean> and standard deviation <stddev>, i.e. normal distribution without negative values. Example: truncnormal1000,500.
 
 A configured distribution is used to determine:

src/netperfmeter.1

@@ -212,7 +212,7 @@ Exponential distribution with mean <mean>. Example: exp1000.
 Pareto distribution with location <location> and shape <shape>. Example: pareto0.166667,1.5.
 .It normal<mean>,<stddev>
 Normal distribution with mean <mean> and standard deviation <stddev>. Example: normal1000,500.
-Note that normal distribution may result in negative values, which may be ignored (frame size) or interpreted as saturated traffic (frame rate).
+Note that normal distribution may result in negative values, which may be ignored (frame size) or interpreted as saturated traffic (frame rate). Use truncnormal to prevent negative values.
 .It truncnormal<mean>,<stddev>
 Truncated normal distribution with mean <mean> and standard deviation <stddev>, i.e. normal distribution without negative values. Example: truncnormal1000,500.
 .El