diff --git a/src/rules/file/hasDoxygenHeader.spec.ts b/src/rules/file/hasDoxygenHeader.spec.ts
index e29c59c..23af9c6 100644
--- a/src/rules/file/hasDoxygenHeader.spec.ts
+++ b/src/rules/file/hasDoxygenHeader.spec.ts
@@ -17,6 +17,32 @@ describe('hasDoxygenHeader - test', () => {
     expect(hasDoxygenHeader.test(content)).toEqual([])
   })
 
+  it('should return an empty array when the file starts with a doxygen header', () => {
+    const content = `
+    
+    
+    /*
+   @file
+   @brief Returns an unused libref
+ */
+
+ %macro mf_getuniquelibref(prefix=mclib,maxtries=1000);
+   %local x libref;
+   %let x={SAS002};
+   %do x=0 %to &maxtries;`
+
+    expect(hasDoxygenHeader.test(content)).toEqual([
+      {
+        message:
+          'File not following Doxygen header style, use double asterisks',
+        lineNumber: 4,
+        startColumnNumber: 1,
+        endColumnNumber: 1,
+        severity: Severity.Warning
+      }
+    ])
+  })
+
   it('should return an array with a single diagnostic when the file has no header', () => {
     const content = `
  %macro mf_getuniquelibref(prefix=mclib,maxtries=1000);
@@ -86,7 +112,33 @@ describe('hasDoxygenHeader - fix', () => {
     expect(hasDoxygenHeader.fix!(content)).toEqual(content)
   })
 
-  it('should should add a doxygen header if not present', () => {
+  it('should update single asterisks to double if a doxygen header is already present', () => {
+    const contentOriginal = `
+    /*
+   @file
+   @brief Returns an unused libref
+ */
+
+ %macro mf_getuniquelibref(prefix=mclib,maxtries=1000);
+   %local x libref;
+   %let x={SAS002};
+   %do x=0 %to &maxtries;`
+
+    const contentExpected = `
+    /**
+   @file
+   @brief Returns an unused libref
+ */
+
+ %macro mf_getuniquelibref(prefix=mclib,maxtries=1000);
+   %local x libref;
+   %let x={SAS002};
+   %do x=0 %to &maxtries;`
+
+    expect(hasDoxygenHeader.fix!(contentOriginal)).toEqual(contentExpected)
+  })
+
+  it('should add a doxygen header if not present', () => {
     const content = `%macro mf_getuniquelibref(prefix=mclib,maxtries=1000);
 %local x libref;
 %let x={SAS002};
diff --git a/src/rules/file/hasDoxygenHeader.ts b/src/rules/file/hasDoxygenHeader.ts
index 2a5c75b..2a81d55 100644
--- a/src/rules/file/hasDoxygenHeader.ts
+++ b/src/rules/file/hasDoxygenHeader.ts
@@ -10,10 +10,28 @@ const name = 'hasDoxygenHeader'
 const description =
   'Enforce the presence of a Doxygen header at the start of each file.'
 const message = 'File missing Doxygen header'
-const test = (value: string) => {
+const messageForSingleAsterisk =
+  'File not following Doxygen header style, use double asterisks'
+const test = (value: string, config?: LintConfig) => {
+  const lineEnding = config?.lineEndings === LineEndings.CRLF ? '\r\n' : '\n'
   try {
-    const hasFileHeader = value.trimStart().startsWith('/*')
+    const hasFileHeader = value.trimStart().startsWith('/**')
     if (hasFileHeader) return []
+
+    const hasFileHeaderWithSingleAsterisk = value.trimStart().startsWith('/*')
+    if (hasFileHeaderWithSingleAsterisk)
+      return [
+        {
+          message: messageForSingleAsterisk,
+          lineNumber:
+            (value.split('/*')![0]!.match(new RegExp(lineEnding, 'g')) ?? [])
+              .length + 1,
+          startColumnNumber: 1,
+          endColumnNumber: 1,
+          severity: Severity.Warning
+        }
+      ]
+
     return [
       {
         message,
@@ -37,9 +55,12 @@ const test = (value: string) => {
 }
 
 const fix = (value: string, config?: LintConfig): string => {
-  if (test(value).length === 0) {
+  const result = test(value, config)
+  if (result.length === 0) {
     return value
-  }
+  } else if (result[0].message == messageForSingleAsterisk)
+    return value.replace('/*', '/**')
+
   const lineEndingConfig = config?.lineEndings || LineEndings.LF
   const lineEnding = lineEndingConfig === LineEndings.LF ? '\n' : '\r\n'