Index: graphspell-js/ibdawg.js
==================================================================
--- graphspell-js/ibdawg.js
+++ graphspell-js/ibdawg.js
@@ -172,12 +172,12 @@
                 break;
             default:
                 throw ValueError("# Error: unknown code: " + this.nCompressionMethod);
         }
         //console.log(this.getInfo());
-        this.bOptNumSigle = true;
-        this.bOptNumAtLast = false;
+        this.bAcronymValid = true;
+        this.bNumAtLastValid = false;
     }
 
     getInfo () {
         return  `  Language: ${this.sLangName}   Lang code: ${this.sLangCode}   Dictionary name: ${this.sDicName}\n` +
                 `  Compression method: ${this.nCompressionMethod}   Date: ${this.sDate}   Stemming: ${this.cStemming}FX\n` +
@@ -246,11 +246,11 @@
             if (sWord.length > 1) {
                 if (sWord.gl_isTitle()) {
                     return !!this.lookup(sWord.toLowerCase());
                 }
                 if (sWord.gl_isUpperCase()) {
-                    if (this.bOptNumSigle) {
+                    if (this.bAcronymValid) {
                         return true;
                     }
                     return !!(this.lookup(sWord.toLowerCase()) || this.lookup(sWord.gl_toCapitalize()));
                 }
                 return !!this.lookup(sWord.slice(0, 1).toLowerCase() + sWord.slice(1));

Index: graphspell/ibdawg.py
==================================================================
--- graphspell/ibdawg.py
+++ graphspell/ibdawg.py
@@ -133,12 +133,12 @@
             self._getArcs = self._getArcs3
             self._writeNodes = self._writeNodes3
         else:
             raise ValueError("  # Error: unknown code: {}".format(self.nCompressionMethod))
 
-        self.bOptNumSigle = False
-        self.bOptNumAtLast = False
+        self.bAcronymValid = True
+        self.bNumAtLastValid = False
 
     def _initBinary (self):
         "initialize with binary structure file"
         if self.by[0:17] != b"/grammalecte-fsa/":
             raise TypeError("# Error. Not a grammalecte-fsa binary dictionary. Header: {}".format(self.by[0:9]))
@@ -247,11 +247,11 @@
         if sWord[0:1].isupper():
             if len(sWord) > 1:
                 if sWord.istitle():
                     return self.lookup(sWord.lower())
                 if sWord.isupper():
-                    if self.bOptNumSigle:
+                    if self.bAcronymValid:
                         return True
                     return self.lookup(sWord.lower()) or self.lookup(sWord.capitalize())
                 return self.lookup(sWord[:1].lower() + sWord[1:])
             else:
                 return self.lookup(sWord.lower())