bump version

Author: baggepinnen

lib/ControlSystemsBase/Project.toml

@@ -2,7 +2,7 @@ name = "ControlSystemsBase"
 uuid = "aaaaaaaa-a6ca-5380-bf3e-84a91bcd477e"
 authors = ["Dept. Automatic Control, Lund University"]
 repo = "https://github.com/JuliaControl/ControlSystems.jl.git"
-version = "1.15.1"
+version = "1.16.0"
 
 [deps]
 ForwardDiff = "f6369f11-7733-5829-9624-2563aa707210"

lib/ControlSystemsBase/src/analysis.jl

@@ -623,6 +623,8 @@ end
 
 Return the delay margin, dₘ. For discrete-time systems, the delay margin is normalized by the sample time, i.e., the value represents the margin in number of sample times. 
 Only supports SISO systems.
+
+The delay margin is computed as the phase margin in radians divided by the cross-over frequency in rad/s. The delay margin is the maximum time delay that can be added to the system before it becomes unstable.
 """
 function delaymargin(G::LTISystem)
     # Phase margin in radians divided by cross-over frequency in rad/s.