diff --git a/cypress/integration/rendering/gitGraph.spec.js b/cypress/integration/rendering/gitGraph.spec.js
index 52019c430..80981c31c 100644
--- a/cypress/integration/rendering/gitGraph.spec.js
+++ b/cypress/integration/rendering/gitGraph.spec.js
@@ -253,4 +253,32 @@ describe('Git Graph diagram', () => {
       {}
     );
   });
+  it('13: should render a simple gitgraph with three branches,custom merge commit id,tag,type', () => {
+    imgSnapshotTest(
+      `gitGraph
+       commit id: "1"
+       commit id: "2"
+       branch nice_feature
+       checkout nice_feature
+       commit id: "3"
+       checkout main
+       commit id: "4"
+       checkout nice_feature
+       branch very_nice_feature
+       checkout very_nice_feature
+       commit id: "5"
+       checkout main
+       commit id: "6"
+       checkout nice_feature
+       commit id: "7"
+       checkout main
+       merge nice_feature id: "customID" tag: "customTag" type: REVERSE
+       checkout very_nice_feature
+       commit id: "8"
+       checkout main
+       commit id: "9"
+      `,
+      {}
+    );
+  });
 });
diff --git a/docs/gitgraph.md b/docs/gitgraph.md
index 53e802101..191bc513b 100644
--- a/docs/gitgraph.md
+++ b/docs/gitgraph.md
@@ -182,7 +182,40 @@ After this we made use of the `checkout` keyword to set the current branch as `m
 After this we merge the `develop` branch onto the current branch `main`, resulting in a merge commit.
 Since the current branch at this point is still `main`, the last two commits are registered against that.
 
-Additionally, you may add a tag to the merge commit, or override the default id: `merge branch id:"1234" tag:"v1.0.0"`
+You can also decorate your merge with similar attributes as you did for the commit using:
+- `id`--> To override the default ID with custom ID
+- `tag`--> To add a custom tag to your merge commit
+- `type`--> To override the default shape of merge commit. Here you can use other commit type mentioned earlier.
+
+And you can choose to use none, some or all of these attributes together.
+For example: `merge develop id: "my_custom_id" tag: "my_custom_tag" type: REVERSE`
+
+Let us see how this works with the help of the following diagram:
+
+```mermaid-example
+    gitGraph
+       commit id: "1"
+       commit id: "2"
+       branch nice_feature
+       checkout nice_feature
+       commit id: "3"
+       checkout main
+       commit id: "4"
+       checkout nice_feature
+       branch very_nice_feature
+       checkout very_nice_feature
+       commit id: "5"
+       checkout main
+       commit id: "6"
+       checkout nice_feature
+       commit id: "7"
+       checkout main
+       merge nice_feature id: "customID" tag: "customTag" type: REVERSE
+       checkout very_nice_feature
+       commit id: "8"
+       checkout main
+       commit id: "9"
+```
 
 ### Cherry Pick commit from another branch
 Similar to how 'git' allows you to cherry-pick a commit from **another branch** onto the **current** branch, Mermaid also supports this functionality. You can also cherry-pick a commit from another branch using the `cherry-pick` keyword.
diff --git a/package.json b/package.json
index a8e6221dc..824a4e13f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "mermaid",
-  "version": "9.1.5",
+  "version": "9.1.6",
   "description": "Markdownish syntax for generating flowcharts, sequence diagrams, class diagrams, gantt charts and git graphs.",
   "main": "dist/mermaid.min.js",
   "module": "dist/mermaid.esm.min.mjs",
diff --git a/src/diagrams/git/gitGraphAst.js b/src/diagrams/git/gitGraphAst.js
index 6cec8bdd8..47c3e9f30 100644
--- a/src/diagrams/git/gitGraphAst.js
+++ b/src/diagrams/git/gitGraphAst.js
@@ -148,16 +148,9 @@ export const branch = function (name, order) {
   }
 };
 
-/**
- * Creates a merge commit.
- *
- * @param {string} otherBranch - Target branch to merge to.
- * @param {string} [tag] - Git tag to use on this merge commit.
- * @param {string} [id] - Git commit id.
- */
-export const merge = function (otherBranch, tag, id) {
+export const merge = function (otherBranch, custom_id, override_type, custom_tag) {
   otherBranch = common.sanitizeText(otherBranch, configApi.getConfig());
-  id = common.sanitizeText(id, configApi.getConfig());
+  custom_id = common.sanitizeText(custom_id, configApi.getConfig());
 
   const currentCommit = commits[branches[curBranch]];
   const otherCommit = commits[branches[otherBranch]];
@@ -216,6 +209,23 @@ export const merge = function (otherBranch, tag, id) {
       loc: { first_line: 1, last_line: 1, first_column: 1, last_column: 1 },
       expected: ['branch abc'],
     };
+    throw error;
+  } else if (custom_id && typeof commits[custom_id] !== 'undefined') {
+    let error = new Error(
+      'Incorrect usage of "merge". Commit with id:' +
+        custom_id +
+        ' already exists, use different custom Id'
+    );
+    error.hash = {
+      text: 'merge ' + otherBranch + custom_id + override_type + custom_tag,
+      token: 'merge ' + otherBranch + custom_id + override_type + custom_tag,
+      line: '1',
+      loc: { first_line: 1, last_line: 1, first_column: 1, last_column: 1 },
+      expected: [
+        'merge ' + otherBranch + ' ' + custom_id + '_UNIQUE ' + override_type + ' ' + custom_tag,
+      ],
+    };
+
     throw error;
   }
   // if (isReachableFrom(currentCommit, otherCommit)) {
@@ -228,13 +238,15 @@ export const merge = function (otherBranch, tag, id) {
   // } else {
   // create merge commit
   const commit = {
-    id: id || seq + '-' + getId(),
+    id: custom_id ? custom_id : seq + '-' + getId(),
     message: 'merged branch ' + otherBranch + ' into ' + curBranch,
     seq: seq++,
     parents: [head == null ? null : head.id, branches[otherBranch]],
     branch: curBranch,
     type: commitType.MERGE,
-    tag: tag ? tag : '',
+    customType: override_type,
+    customId: custom_id ? true : false,
+    tag: custom_tag ? custom_tag : '',
   };
   head = commit;
   commits[commit.id] = commit;
diff --git a/src/diagrams/git/gitGraphParserV2.spec.js b/src/diagrams/git/gitGraphParserV2.spec.js
index 9c8e47443..9ddc981af 100644
--- a/src/diagrams/git/gitGraphParserV2.spec.js
+++ b/src/diagrams/git/gitGraphParserV2.spec.js
@@ -496,7 +496,7 @@ describe('when parsing a gitGraph', function () {
     ]);
   });
 
-  it('should handle merge ids', function () {
+  it('should handle merge with custom ids, tags and typr', function () {
     const str = `gitGraph:
       commit
       branch testBranch
@@ -510,7 +510,7 @@ describe('when parsing a gitGraph', function () {
       commit
       checkout main
       %% Merge ID and Tag (reverse order)
-      merge testBranch2 id: "4-444" tag: "merge-tag2"
+      merge testBranch2 id: "4-444" tag: "merge-tag2" type:HIGHLIGHT
       branch testBranch3
       checkout testBranch3
       commit
@@ -553,6 +553,8 @@ describe('when parsing a gitGraph', function () {
     expect(testBranch2Merge.parents).toStrictEqual([testBranchMerge.id, testBranch2Commit.id]);
     expect(testBranch2Merge.tag).toBe('merge-tag2');
     expect(testBranch2Merge.id).toBe('4-444');
+    expect(testBranch2Merge.customType).toBe(2);
+    expect(testBranch2Merge.customId).toBe(true);
 
     expect(testBranch3Merge.branch).toBe('main');
     expect(testBranch3Merge.parents).toStrictEqual([testBranch2Merge.id, testBranch3Commit.id]);
@@ -687,6 +689,27 @@ describe('when parsing a gitGraph', function () {
       expect(e.message).toBe('Incorrect usage of "merge". Cannot merge a branch to itself');
     }
   });
+
+  it('should throw error when using existing id as merge ID', function () {
+    const str = `gitGraph
+    commit id: "1-111"
+    branch testBranch
+    commit id: "2-222"
+    commit id: "3-333"
+    checkout main
+    merge testBranch id: "1-111"
+    `;
+
+    try {
+      parser.parse(str);
+      // Fail test if above expression doesn't throw anything.
+      expect(true).toBe(false);
+    } catch (e) {
+      expect(e.message).toBe(
+        'Incorrect usage of "merge". Commit with id:1-111 already exists, use different custom Id'
+      );
+    }
+  });
   it('should throw error when trying to merge branches having same heads', function () {
     const str = `gitGraph
     commit
diff --git a/src/diagrams/git/gitGraphRenderer.js b/src/diagrams/git/gitGraphRenderer.js
index 7dce4d748..73588fa2d 100644
--- a/src/diagrams/git/gitGraphRenderer.js
+++ b/src/diagrams/git/gitGraphRenderer.js
@@ -91,7 +91,9 @@ const drawCommits = (svg, commits, modifyGraph) => {
     // Don't draw the commits now but calculate the positioning which is used by the branch lines etc.
     if (modifyGraph) {
       let typeClass;
-      switch (commit.type) {
+      let commitSymbolType =
+        typeof commit.customType !== 'undefined' ? commit.customType : commit.type;
+      switch (commitSymbolType) {
         case commitType.NORMAL:
           typeClass = 'commit-normal';
           break;
@@ -111,7 +113,7 @@ const drawCommits = (svg, commits, modifyGraph) => {
           typeClass = 'commit-normal';
       }
 
-      if (commit.type === commitType.HIGHLIGHT) {
+      if (commitSymbolType === commitType.HIGHLIGHT) {
         const circle = gBullets.append('rect');
         circle.attr('x', x - 10);
         circle.attr('y', y - 10);
@@ -135,7 +137,7 @@ const drawCommits = (svg, commits, modifyGraph) => {
               branchPos[commit.branch].index % THEME_COLOR_LIMIT
             } ${typeClass}-inner`
           );
-      } else if (commit.type === commitType.CHERRY_PICK) {
+      } else if (commitSymbolType === commitType.CHERRY_PICK) {
         gBullets
           .append('circle')
           .attr('cx', x)
@@ -181,7 +183,7 @@ const drawCommits = (svg, commits, modifyGraph) => {
           'class',
           `commit ${commit.id} commit${branchPos[commit.branch].index % THEME_COLOR_LIMIT}`
         );
-        if (commit.type === commitType.MERGE) {
+        if (commitSymbolType === commitType.MERGE) {
           const circle2 = gBullets.append('circle');
           circle2.attr('cx', x);
           circle2.attr('cy', y);
@@ -193,7 +195,7 @@ const drawCommits = (svg, commits, modifyGraph) => {
             }`
           );
         }
-        if (commit.type === commitType.REVERSE) {
+        if (commitSymbolType === commitType.REVERSE) {
           const cross = gBullets.append('path');
           cross
             .attr('d', `M ${x - 5},${y - 5}L${x + 5},${y + 5}M${x - 5},${y + 5}L${x + 5},${y - 5}`)
@@ -215,7 +217,12 @@ const drawCommits = (svg, commits, modifyGraph) => {
       const px = 4;
       const py = 2;
       // Draw the commit label
-      if (commit.type !== commitType.CHERRY_PICK && gitGraphConfig.showCommitLabel) {
+      if (
+        commit.type !== commitType.CHERRY_PICK &&
+        ((commit.customId && commit.type === commitType.MERGE) ||
+          commit.type !== commitType.MERGE) &&
+        gitGraphConfig.showCommitLabel
+      ) {
         const wrapper = gLabels.append('g');
         const labelBkg = wrapper.insert('rect').attr('class', 'commit-label-bkg');
 
diff --git a/src/diagrams/git/parser/gitGraph.jison b/src/diagrams/git/parser/gitGraph.jison
index c7f1fbe27..937a7192a 100644
--- a/src/diagrams/git/parser/gitGraph.jison
+++ b/src/diagrams/git/parser/gitGraph.jison
@@ -121,11 +121,22 @@ cherryPickStatement
     ;
 
 mergeStatement
-    : MERGE ID {yy.merge($2)}
-    | MERGE ID COMMIT_TAG STR {yy.merge($2, $4)}
-    | MERGE ID COMMIT_ID STR {yy.merge($2, '', $4)}
-    | MERGE ID COMMIT_TAG STR COMMIT_ID STR {yy.merge($2, $4, $6)}
-    | MERGE ID COMMIT_ID STR COMMIT_TAG STR {yy.merge($2, $6, $4)}
+    : MERGE ID {yy.merge($2,'','','')}
+    | MERGE ID COMMIT_ID STR {yy.merge($2, $4,'','')}
+    | MERGE ID COMMIT_TYPE commitType  {yy.merge($2,'', $4,'')}
+    | MERGE ID COMMIT_TAG STR {yy.merge($2, '','',$4)}
+    | MERGE ID COMMIT_TAG STR COMMIT_ID STR {yy.merge($2, $6,'', $4)}
+    | MERGE ID COMMIT_TAG STR COMMIT_TYPE commitType {yy.merge($2, '',$6, $4)}
+    | MERGE ID COMMIT_TYPE commitType COMMIT_TAG STR {yy.merge($2, '',$4, $6)}
+    | MERGE ID COMMIT_ID STR COMMIT_TYPE commitType {yy.merge($2, $4, $6, '')}
+    | MERGE ID COMMIT_ID STR COMMIT_TAG STR {yy.merge($2, $4, '', $6)}
+    | MERGE ID COMMIT_TYPE commitType COMMIT_ID STR {yy.merge($2, $6,$4, '')}
+    | MERGE ID COMMIT_ID STR COMMIT_TYPE commitType COMMIT_TAG STR {yy.merge($2, $4, $6, $8)}
+    | MERGE ID COMMIT_TYPE commitType COMMIT_TAG STR COMMIT_ID STR {yy.merge($2, $8, $4, $6)}
+    | MERGE ID COMMIT_ID STR COMMIT_TAG STR COMMIT_TYPE commitType {yy.merge($2, $4, $8, $6)}
+    | MERGE ID COMMIT_TYPE commitType COMMIT_ID STR COMMIT_TAG STR {yy.merge($2, $6, $4, $8)}
+    | MERGE ID COMMIT_TAG STR COMMIT_TYPE commitType COMMIT_ID STR {yy.merge($2, $8, $6, $4)}
+    | MERGE ID COMMIT_TAG STR COMMIT_ID STR COMMIT_TYPE commitType {yy.merge($2, $6, $8, $4)}
     ;
 
 commitStatement