diff --git a/src/services/import/mime.spec.ts b/src/services/import/mime.spec.ts
index 7281d31c2..5b04d0f2a 100644
--- a/src/services/import/mime.spec.ts
+++ b/src/services/import/mime.spec.ts
@@ -30,6 +30,10 @@ describe("#getMime", () => {
             "File extension ('.mermaid') that is defined in EXTENSION_TO_MIME",
             ["test.mermaid"], "text/vnd.mermaid"
         ],
+        [
+            "File extension ('.mermaid') that is defined in EXTENSION_TO_MIME",
+            ["test.mmd"], "text/vnd.mermaid"
+        ],
 
         [
             "File extension with inconsistent capitalization that is defined in EXTENSION_TO_MIME",
diff --git a/src/services/import/mime.ts b/src/services/import/mime.ts
index cb400b8d8..5f050184f 100644
--- a/src/services/import/mime.ts
+++ b/src/services/import/mime.ts
@@ -70,7 +70,8 @@ const EXTENSION_TO_MIME = new Map<string, string>([
     [".swift", "text/x-swift"],
     [".ts", "text/x-typescript"],
     [".excalidraw", "application/json"],
-    [".mermaid", "text/vnd.mermaid"]
+    [".mermaid", "text/vnd.mermaid"],
+    [".mmd", "text/vnd.mermaid"]
 ]);
 
 /** @returns false if MIME is not detected */
diff --git a/src/services/import/samples/New note.mmd b/src/services/import/samples/New note.mmd
new file mode 100644
index 000000000..577e63359
--- /dev/null
+++ b/src/services/import/samples/New note.mmd	
@@ -0,0 +1,5 @@
+graph TD;
+    A-->B;
+    A-->C;
+    B-->D;
+    C-->D;
\ No newline at end of file
diff --git a/src/services/import/single.spec.ts b/src/services/import/single.spec.ts
index 060801eb9..e26934b08 100644
--- a/src/services/import/single.spec.ts
+++ b/src/services/import/single.spec.ts
@@ -97,7 +97,7 @@ describe("processNoteContent", () => {
         expect(importedNote.title).toBe("New note");
     });
 
-    it("supports mermaid note", async () => {
+    it("imports .mermaid as mermaid note", async () => {
         const { importedNote } = await testImport("New note.mermaid", "application/json");
         expect(importedNote).toMatchObject({
             mime: "text/vnd.mermaid",
@@ -105,4 +105,13 @@ describe("processNoteContent", () => {
             title: "New note"
         });
     });
+
+    it("imports .mmd as mermaid note", async () => {
+        const { importedNote } = await testImport("New note.mmd", "application/json");
+        expect(importedNote).toMatchObject({
+            mime: "text/vnd.mermaid",
+            type: "mermaid",
+            title: "New note"
+        });
+    });
 });
diff --git a/src/services/utils.ts b/src/services/utils.ts
index 87dcf2d67..926e24fb4 100644
--- a/src/services/utils.ts
+++ b/src/services/utils.ts
@@ -182,6 +182,7 @@ export function removeTextFileExtension(filePath: string) {
         case ".htm":
         case ".excalidraw":
         case ".mermaid":
+        case ".mmd":
             return filePath.substring(0, filePath.length - extension.length);
         default:
             return filePath;