diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index 7688aad98b845..2795b45515871 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -699,7 +699,7 @@ const commandOptionsWithoutBuild: CommandLineOption[] = [
         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,
-        defaultValueDescription: false,
+        defaultValueDescription: Diagnostics.false_unless_checkJs_is_set,
     },
     {
         name: "checkJs",
diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index 3d31d02ea8dbc..4ccbd0c325b0c 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -6699,6 +6699,10 @@
         "category": "Error",
         "code": 6931
     },
+    "`false`, unless `checkJs` is set": {
+        "category": "Message",
+        "code": 6932
+    },
 
     "Variable '{0}' implicitly has an '{1}' type.": {
         "category": "Error",
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 94f118c9de213..29b35c6766a55 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
@@ -120,7 +120,7 @@ default: undefined
 --allowJs
 Allow JavaScript files to be a part of your program. Use the 'checkJs' option to get errors from these files.
 type: boolean
-default: false
+default: `false`, unless `checkJs` is set
 
 --checkJs
 Enable error reporting in type-checked JavaScript files.
diff --git a/tests/baselines/reference/tsc/commandLine/help-all.js b/tests/baselines/reference/tsc/commandLine/help-all.js
index 11e16a0603137..798166927aeeb 100644
--- a/tests/baselines/reference/tsc/commandLine/help-all.js
+++ b/tests/baselines/reference/tsc/commandLine/help-all.js
@@ -147,7 +147,7 @@ Specify type package names to be included without being referenced in a source f
 --allowJs
 Allow JavaScript files to be a part of your program. Use the 'checkJs' option to get errors from these files.
 type: boolean
-default: false
+default: `false`, unless `checkJs` is set
 
 --checkJs
 Enable error reporting in type-checked JavaScript files.
diff --git a/tests/baselines/reference/tsc/commandLine/help.js b/tests/baselines/reference/tsc/commandLine/help.js
index ceeacaed38e66..a0cbf0a3bcdcc 100644
--- a/tests/baselines/reference/tsc/commandLine/help.js
+++ b/tests/baselines/reference/tsc/commandLine/help.js
@@ -119,7 +119,7 @@ default: undefined
 --allowJs
 Allow JavaScript files to be a part of your program. Use the 'checkJs' option to get errors from these files.
 type: boolean
-default: false
+default: `false`, unless `checkJs` is set
 
 --checkJs
 Enable error reporting in type-checked JavaScript files.
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 9dc2e08154928..c0866e70cca98 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
@@ -120,7 +120,7 @@ default: undefined
 --allowJs
 Allow JavaScript files to be a part of your program. Use the 'checkJs' option to get errors from these files.
 type: boolean
-default: false
+default: `false`, unless `checkJs` is set
 
 --checkJs
 Enable error reporting in type-checked JavaScript files.
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 9dc2e08154928..c0866e70cca98 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
@@ -120,7 +120,7 @@ default: undefined
 --allowJs
 Allow JavaScript files to be a part of your program. Use the 'checkJs' option to get errors from these files.
 type: boolean
-default: false
+default: `false`, unless `checkJs` is set
 
 --checkJs
 Enable error reporting in type-checked JavaScript files.