diff --git a/Changes b/Changes
index 271d991..f47c190 100755
--- a/Changes
+++ b/Changes
@@ -1,3 +1,6 @@
+0.50 2023-03-27
+        - Improvement of NKJP-annotation helper. (diewald)
+
 0.49 2023-02-23
         - Introduce conllu2korapxml command via plugin. (diewald)
         - Introduce korapxml2conllu command via plugin. (diewald)
diff --git a/dev/js/src/hint/foundries/nkjp.js b/dev/js/src/hint/foundries/nkjp.js
index 8dc5911..0d176bb 100644
--- a/dev/js/src/hint/foundries/nkjp.js
+++ b/dev/js/src/hint/foundries/nkjp.js
@@ -38,7 +38,7 @@
     ["'naj'","naj ",""],
     ["'nie'","nie ",""],
     ["num","num ","main numeral"],
-    // ["numcol","numcol","collective numeral"],
+    ["numcol","numcol","collective numeral"],
     ["numcomp","numcomp ","numeral compounds forming form"],
     ["pact","pact ","active adjectival participle"],
     ["pacta","pacta ","participal compounds forming form"],
@@ -50,8 +50,6 @@
     ["ppron3","ppron3 ","3rd-person pronoun"],
     ["praet","praet ","l-participle"],
     ["pred","pred ","predicative"],
-    ["prefa","prefa ","prefix"],
-    ["prefs","prefs ","prefix"],
     ["prep","prep ","preposition"],
     ["romandig","romandig ","Roman digits"],
     ["siebie","siebie ","pronoun siebie"],   
@@ -60,7 +58,8 @@
     ["substa","substa ","nominal compounds forming form"],
     ["sym","sym ","symbols"],  
     ["winien","winien ","winien-like verb"],
-    ["xxx","xxx ","foreign material"]
+    ["xxx","xxx ","foreign material"],
+    ["xxs","xxs ","foreign material (substantivish)"]
   ];
 
   ah["nkjp/m="] = [
@@ -74,7 +73,7 @@
     ["Number", "number:"],
     ["Negation", "negation:"],
     ["Post-Prepositionality","postprep:"],
-    ["Vocality","vocal:"]
+    ["Vocalicity","vocal:"]
   ];
 
   ah["nkjp/m=case:"] = [