diff --git a/packages/cspell-lib/src/lib/LanguageIds.test.ts b/packages/cspell-lib/src/lib/LanguageIds.test.ts
index 56c99df1bf3..d107e8df1da 100644
--- a/packages/cspell-lib/src/lib/LanguageIds.test.ts
+++ b/packages/cspell-lib/src/lib/LanguageIds.test.ts
@@ -30,6 +30,8 @@ describe('Validate LanguageIds', () => {
         ${'my-cert.pem'}                     | ${['pem']}
         ${'my-private-cert.private-key.pem'} | ${['pem', 'pem-private-key']}
         ${'Dockerfile'}                      | ${['dockerfile']}
+        ${'Dockerfile.dev'}                  | ${['dockerfile']}
+        ${'code.jl'}                         | ${['julia']}
     `('getLanguagesForBasename $filename', ({ filename, expected }) => {
         expect(LangId.getLanguagesForBasename(filename)).toEqual(expected);
     });
diff --git a/packages/cspell-lib/src/lib/LanguageIds.ts b/packages/cspell-lib/src/lib/LanguageIds.ts
index 2a3a1980630..3e83bd0cd7a 100644
--- a/packages/cspell-lib/src/lib/LanguageIds.ts
+++ b/packages/cspell-lib/src/lib/LanguageIds.ts
@@ -48,7 +48,7 @@ export const languageExtensionDefinitions: LanguageDefinitions = [
     { id: 'css', extensions: ['.css'] },
     { id: 'dhall', extensions: ['.dhall'] },
     { id: 'diff', extensions: ['.diff', '.patch', '.rej'] },
-    { id: 'dockerfile', extensions: ['.dockerfile'], filenames: ['Dockerfile', 'dockerfile'] },
+    { id: 'dockerfile', extensions: ['.dockerfile'], filenames: ['Dockerfile', 'dockerfile', 'Dockerfile.dev'] },
     { id: 'elixir', extensions: ['.ex', '.exs'] },
     { id: 'fsharp', extensions: ['.fs', '.fsi', '.fsx', '.fsscript'] },
     { id: 'go', extensions: ['.go'] },
@@ -71,6 +71,7 @@ export const languageExtensionDefinitions: LanguageDefinitions = [
     },
     { id: 'jsonc', extensions: ['.jsonc'] },
     { id: 'jsonc', extensions: ['.code-workspace'], filenames: ['.code-workspace'] },
+    { id: 'julia', extensions: ['.jl'] },
     { id: 'jungle', extensions: ['.jungle'] },
     { id: 'less', extensions: ['.less'] },
     { id: 'literate haskell', extensions: ['.lhs'] },