diff --git a/src/register/register.ts b/src/register/register.ts
index 6255e6a233b..443493dd664 100644
--- a/src/register/register.ts
+++ b/src/register/register.ts
@@ -42,7 +42,7 @@ export class Register {
    * register ".
    */
   public static put(content: string | string[], vimState: VimState): void {
-    const register = vimState.recordedState.registerName;
+    let register = vimState.recordedState.registerName;
 
     if (!Register.isValidRegister(register)) {
       throw new Error(`Invalid register ${register}`);
@@ -52,6 +52,27 @@ export class Register {
       clipboard.copy(content);
     }
 
+    // Upper-case register name denotes append.
+    if (/^[A-Z]$/.test(register)) {
+     register = register.toLowerCase();
+     let existingText = Register.registers[register] && Register.registers[register].text;
+     if (existingText) {
+      if (typeof content === 'string') {
+        if (typeof existingText === 'string') {
+          content = existingText + (existingText.endsWith('\n') ? '' : '\n') + content;
+        } else {
+          content = existingText.concat(content.split('\n'));
+        }
+      } else {
+        if (typeof existingText === 'string') {
+          content = existingText.split('\n').concat(content);
+        } else {
+          content = existingText.concat(content);
+        }
+      }
+     }
+    }
+
     Register.registers[register] = {
       text        : content,
       registerMode: vimState.effectiveRegisterMode(),
@@ -72,6 +93,11 @@ export class Register {
       throw new Error(`Invalid register ${register}`);
     }
 
+    // Retrieving register content is case-insensitive
+    if (/^[A-Z]$/.test(register)) {
+      register = register.toLowerCase();
+    }
+
     if (!Register.registers[register]) {
       Register.registers[register] = { text: "", registerMode: RegisterMode.CharacterWise };
     }
diff --git a/test/register/register.test.ts b/test/register/register.test.ts
index 6f67906566d..9ea4689cf24 100644
--- a/test/register/register.test.ts
+++ b/test/register/register.test.ts
@@ -48,4 +48,18 @@ suite("register", () => {
     end: ["one", "two", "one", "|two"],
   });
 
+  newTest({
+    title: "Can append content to register",
+    start: ['|one', "two"],
+    keysPressed: '"ayyj"Ayy$"ap',
+    end: ["one", "two", "|one", "two"],
+  });
+
+  newTest({
+    title: "Can replace register contents after append",
+    start: ['|one', "two", "three"],
+    keysPressed: '"ayyj"Ayyj"ayy$"ap',
+    end: ["one", "two", "three", "|three"],
+  });
+
 });
\ No newline at end of file