Specify Javadoc HTML version and add documentation

build.gradle

@@ -14,6 +14,7 @@ assert hasProperty('java9Home'): "Set the property 'java9Home' in your gradle.pr
 sourceCompatibility = 1.6
 targetCompatibility = 1.6
 javadoc.options.links("http://docs.oracle.com/javase/8/docs/api/")
+javadoc.options.addBooleanOption('html4', true)
 
 def java6ExecutablesPath = new File(java6Home, 'bin')
 def java9ExecutablesPath = new File(java9Home, 'bin')

src/main/java/com/fazecast/jSerialComm/SerialPort.java

@@ -605,11 +605,13 @@ public final class SerialPort
 	public final boolean clearDTR() { return clearDTR(portHandle); }
 
 	/**
+	 * Returns whether the CTS line is currently asserted.
 	 * @return Whether or not the CTS line is asserted.
 	 */
 	public final boolean getCTS() { return getCTS(portHandle); }
 
 	/**
+	 * Returns whether the DSR line is currently asserted.
 	 * @return Whether or not the DSR line is asserted.
 	 */
 	public final boolean getDSR() { return getDSR(portHandle); }