diff --git a/src/renderer/src/lib/language-detect.test.ts b/src/renderer/src/lib/language-detect.test.ts
index e3efd8de4..a223a8645 100644
--- a/src/renderer/src/lib/language-detect.test.ts
+++ b/src/renderer/src/lib/language-detect.test.ts
@@ -29,4 +29,12 @@ describe('detectLanguage', () => {
     expect(detectLanguage('scripts/setup.bat')).toBe('bat')
     expect(detectLanguage('C:\\repo\\scripts\\bootstrap.CMD')).toBe('bat')
   })
+
+  it('maps SystemVerilog and Verilog files to their Monaco language ids', () => {
+    expect(detectLanguage('rtl/cpu.sv')).toBe('systemverilog')
+    expect(detectLanguage('rtl/pkg.svh')).toBe('systemverilog')
+    expect(detectLanguage('rtl/alu.v')).toBe('verilog')
+    expect(detectLanguage('rtl/defs.vh')).toBe('verilog')
+    expect(detectLanguage('C:\\rtl\\TOP.SV')).toBe('systemverilog')
+  })
 })
diff --git a/src/renderer/src/lib/language-detect.ts b/src/renderer/src/lib/language-detect.ts
index d4655effb..857750cd3 100644
--- a/src/renderer/src/lib/language-detect.ts
+++ b/src/renderer/src/lib/language-detect.ts
@@ -80,6 +80,10 @@ const EXT_TO_LANGUAGE: Record<string, string> = {
   '.vue': 'vue',
   '.svelte': 'svelte',
   '.astro': 'astro',
+  '.sv': 'systemverilog',
+  '.svh': 'systemverilog',
+  '.v': 'verilog',
+  '.vh': 'verilog',
   '.nim': 'nim',
   '.nims': 'nim',
   '.nimble': 'nim',