diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index c705ac8f92c8f..345eff350521b 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -697,7 +697,7 @@ const commandOptionsWithoutBuild: CommandLineOption[] = [
         affectsBuildInfo: true,
         showInSimplifiedHelpView: true,
         category: Diagnostics.JavaScript_Support,
-        description: Diagnostics.Allow_JavaScript_files_to_be_a_part_of_your_program_Use_the_checkJS_option_to_get_errors_from_these_files,
+        description: Diagnostics.Allow_JavaScript_files_to_be_a_part_of_your_program_Use_the_checkJs_option_to_get_errors_from_these_files,
         defaultValueDescription: false,
     },
     {
diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index 1861fc2e5646e..6e75ea72826e0 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -6062,7 +6062,7 @@
         "category": "Message",
         "code": 6506
     },
-    "Allow JavaScript files to be a part of your program. Use the 'checkJS' option to get errors from these files.": {
+    "Allow JavaScript files to be a part of your program. Use the 'checkJs' option to get errors from these files.": {
         "category": "Message",
         "code": 6600
     },
diff --git a/tests/baselines/reference/tsc/commandLine/does-not-add-color-when-NO_COLOR-is-set.js b/tests/baselines/reference/tsc/commandLine/does-not-add-color-when-NO_COLOR-is-set.js
index 4fd0fed8d7d03..740a45787cc9d 100644
--- a/tests/baselines/reference/tsc/commandLine/does-not-add-color-when-NO_COLOR-is-set.js
+++ b/tests/baselines/reference/tsc/commandLine/does-not-add-color-when-NO_COLOR-is-set.js
@@ -119,7 +119,7 @@ one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021
 default: undefined
 
 --allowJs
-Allow JavaScript files to be a part of your program. Use the 'checkJS' option to get errors from these files.
+Allow JavaScript files to be a part of your program. Use the 'checkJs' option to get errors from these files.
 type: boolean
 default: false
 
diff --git a/tests/baselines/reference/tsc/commandLine/help-all.js b/tests/baselines/reference/tsc/commandLine/help-all.js
index f8748d79684ec..870ed4a131e1d 100644
--- a/tests/baselines/reference/tsc/commandLine/help-all.js
+++ b/tests/baselines/reference/tsc/commandLine/help-all.js
@@ -146,7 +146,7 @@ Specify type package names to be included without being referenced in a source f
 ### JavaScript Support
 
 --allowJs
-Allow JavaScript files to be a part of your program. Use the 'checkJS' option to get errors from these files.
+Allow JavaScript files to be a part of your program. Use the 'checkJs' option to get errors from these files.
 type: boolean
 default: false
 
diff --git a/tests/baselines/reference/tsc/commandLine/help.js b/tests/baselines/reference/tsc/commandLine/help.js
index 67e3304223a88..fcfab2360a32a 100644
--- a/tests/baselines/reference/tsc/commandLine/help.js
+++ b/tests/baselines/reference/tsc/commandLine/help.js
@@ -118,7 +118,7 @@ one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021
 default: undefined
 
 --allowJs
-Allow JavaScript files to be a part of your program. Use the 'checkJS' option to get errors from these files.
+Allow JavaScript files to be a part of your program. Use the 'checkJs' option to get errors from these files.
 type: boolean
 default: false
 
diff --git a/tests/baselines/reference/tsc/commandLine/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js b/tests/baselines/reference/tsc/commandLine/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js
index 829577fef216a..3428608471470 100644
--- a/tests/baselines/reference/tsc/commandLine/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js
+++ b/tests/baselines/reference/tsc/commandLine/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js
@@ -119,7 +119,7 @@ one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021
 default: undefined
 
 --allowJs
-Allow JavaScript files to be a part of your program. Use the 'checkJS' option to get errors from these files.
+Allow JavaScript files to be a part of your program. Use the 'checkJs' option to get errors from these files.
 type: boolean
 default: false
 
diff --git a/tests/baselines/reference/tsc/commandLine/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js b/tests/baselines/reference/tsc/commandLine/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js
index 829577fef216a..3428608471470 100644
--- a/tests/baselines/reference/tsc/commandLine/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js
+++ b/tests/baselines/reference/tsc/commandLine/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js
@@ -119,7 +119,7 @@ one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021
 default: undefined
 
 --allowJs
-Allow JavaScript files to be a part of your program. Use the 'checkJS' option to get errors from these files.
+Allow JavaScript files to be a part of your program. Use the 'checkJs' option to get errors from these files.
 type: boolean
 default: false