diff --git a/packages/cspell-lib/src/lib/LanguageIds.ts b/packages/cspell-lib/src/lib/LanguageIds.ts
index cd289e89c02..2a3a1980630 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'] },
+    { id: 'dockerfile', extensions: ['.dockerfile'], filenames: ['Dockerfile', 'dockerfile'] },
     { id: 'elixir', extensions: ['.ex', '.exs'] },
     { id: 'fsharp', extensions: ['.fs', '.fsi', '.fsx', '.fsscript'] },
     { id: 'go', extensions: ['.go'] },
@@ -75,7 +75,7 @@ export const languageExtensionDefinitions: LanguageDefinitions = [
     { id: 'less', extensions: ['.less'] },
     { id: 'literate haskell', extensions: ['.lhs'] },
     { id: 'lua', extensions: ['.lua'] },
-    { id: 'makefile', extensions: ['.mk'] },
+    { id: 'makefile', extensions: ['.mk'], filenames: ['makefile'] },
     { id: 'markdown', extensions: ['.md', '.mdown', '.markdown', '.markdn'] },
     { id: 'mdx', extensions: ['.mdx'] },
     { id: 'monkeyc', extensions: ['.mc', '.mb'] },