diff --git a/src/main/java/jnr/posix/util/SunMiscSignal.java b/src/main/java/jnr/posix/util/SunMiscSignal.java
index e29c65c..4c550d9 100644
--- a/src/main/java/jnr/posix/util/SunMiscSignal.java
+++ b/src/main/java/jnr/posix/util/SunMiscSignal.java
@@ -10,8 +10,10 @@ public static SignalHandler signal(jnr.constants.platform.Signal sig, final Sign
         sun.misc.SignalHandler oldHandler = Signal.handle(s, new SunMiscSignalHandler(handler));
 
         if (oldHandler instanceof SunMiscSignalHandler) {
+            // previous custom handler
             return ((SunMiscSignalHandler)oldHandler).handler;
         } else if (oldHandler != null) {
+            // default handler
             return any -> oldHandler.handle(s);
         } else {
             return null;