diff --git a/nx01-x4o-o2o/src/main/java/org/x4o/o2o/fc18/zero33/FCDotAPL1604DashS6.java b/nx01-x4o-o2o/src/main/java/org/x4o/o2o/fc18/zero33/FCDotAPL1604DashS6.java
index 3295e99..db3bc8e 100644
--- a/nx01-x4o-o2o/src/main/java/org/x4o/o2o/fc18/zero33/FCDotAPL1604DashS6.java
+++ b/nx01-x4o-o2o/src/main/java/org/x4o/o2o/fc18/zero33/FCDotAPL1604DashS6.java
@@ -40,6 +40,10 @@ public enum FCDotAPL1604DashS6 implements FourCornerX06BaklavaPoint, FourCornerX
 	
 	// see https://en.wikipedia.org/wiki/Digital_encoding_of_APL_symbols
 	
+	// TODO: repack, move DEC._LL to here and add compound to make space for more letters
+	// GNU APL has the letter ⍨ = APL Functional Symbol Tilde Diaeresis.
+	// Thus remove all compound letters like in ISO-IR-68 
+	
 	/// SL010000
 	UP_STILE('⌈'),
 	/// SL020000