Some doc

Author: wchen-r7

lib/msf/core/exploit.rb

@@ -698,6 +698,14 @@ def target_arch
     (target and target.arch) ? target.arch : (arch == []) ? nil : arch
   end
 
+
+  #
+  # Returns whether the requested payload is compatible with the module.
+  #
+  # @param [String] payload_name The payload name
+  # @return [TrueClass] Payload is compatible.
+  # @return [FalseClass] Payload is not compatible.
+  #
   def is_payload_compatible?(payload_name)
     c_platform = (target and target.platform) ? target.platform : platform
     c_arch     = (target and target.arch)     ? target.arch     : (arch == []) ? nil : arch