diff --git a/README.md b/README.md
index 7f7f726..4904119 100644
--- a/README.md
+++ b/README.md
@@ -77,7 +77,7 @@ Check Spelling inside identifiers
 "ignoreRequire": <<Boolean>>, default: false
 Exclude `require()` imports from spell-checking. Useful for excluding NPM package name false-positives.
 
-"ignoreUpperCaseUnderscore": <<Boolean>>, default: false
+"enableUpperCaseUnderscoreCheck": <<Boolean>>, default: false
 Exclude checking uppercase words separated by an underscore. e.g., `SEARCH_CONDITIONS_LIMIT`
 
 "templates": <<Boolean>>, default: true
diff --git a/rules/spell-checker.js b/rules/spell-checker.js
index c2f44c3..8b16e5f 100644
--- a/rules/spell-checker.js
+++ b/rules/spell-checker.js
@@ -73,7 +73,7 @@ module.exports = {
                         type: 'boolean',
                         default: false
                     },
-                    ignoreUpperCaseUnderscore: {
+                    enableUpperCaseUnderscoreCheck: {
                         type: 'boolean',
                         default: false
                     },
@@ -202,13 +202,12 @@ module.exports = {
         }
 
         function underscoreParser(aNode, value, spellingType) {
-            if (options.ignoreUpperCaseUnderscore) {
+            if (!options.enableUpperCaseUnderscoreCheck) {
                 checkSpelling(aNode, value, spellingType);
             } else {
-                const hasUnderscore = value.split('_').length > 1;
                 const splitValues = value.split('_');
                 splitValues.forEach((word) => {
-                    checkSpelling(aNode, hasUnderscore ? word.toLowerCase() : word, spellingType);
+                    checkSpelling(aNode, word.toLowerCase(), spellingType);
                 })
             }
         }
diff --git a/test/spell-checker.js b/test/spell-checker.js
index c539f7b..7b9f58d 100644
--- a/test/spell-checker.js
+++ b/test/spell-checker.js
@@ -15,10 +15,10 @@ var ruleTester = new RuleTester({
     },
 
     parserOptions: {
-      "ecmaVersion": 2018,
-      "sourceType": "module",
+      'ecmaVersion': 2018,
+      'sourceType': 'module',
         ecmaFeatures: {
-            "modules": true
+            'modules': true
         }
     }
 });
@@ -45,15 +45,13 @@ ruleTester.run('spellcheck/spell-checker', rule, {
         'var a = Math.trunc(-0.1)',
         'var a = "test", test = `${a}`;',
         'var a = "ADD_SUM";',
+        'var a = "ADD_SMU";',
         'const SEARCH_CONDITIONS_LIMIT = 9;',
-        {
-            code: 'var a = "ADD_SMU"',
-            options:[{ ignoreUpperCaseUnderscore: true }]
-        },
-        {
-            code: 'const SEACH_CONDITIONS_LIMIT = 9;',
-            options:[{ ignoreUpperCaseUnderscore: true }]
-        },
+        'const SEACH_CONDITIONS_LIMIT = 9;',
+        'const KEY = "HELLO_WORLD";',
+        'const KEY = "HELLO_WORDL";',
+        'const PASSWORD = "123456";',
+        'const PASSWROD = "123456";',
         {
             code: 'var a = 1 // This is a comment',
             options: [{lang: 'sym', langDir: __dirname}]
@@ -195,13 +193,27 @@ ruleTester.run('spellcheck/spell-checker', rule, {
         },
         {
             code: 'var a = "ADD_SMU"',
+            options:[{ enableUpperCaseUnderscoreCheck: true }],
             errors: [
                 { message: 'You have a misspelled word: smu on String'}]
         },
         {
             code: 'const SEACH_CONDITIONS_LIMIT = 9;',
+            options:[{ enableUpperCaseUnderscoreCheck: true }],
             errors: [
                 { message: 'You have a misspelled word: seach on Identifier'}]
         },
+        {
+            code: 'const KEY = "HELLO_WORDL";',
+            options:[{ enableUpperCaseUnderscoreCheck: true }],
+            errors: [
+                { message: 'You have a misspelled word: wordl on String'}]
+        },
+        {
+            code: 'const PASSWROD = "123456";',
+            options:[{ enableUpperCaseUnderscoreCheck: true }],
+            errors: [
+                { message: 'You have a misspelled word: passwrod on Identifier'}]
+        },
     ]
 });