diff --git a/src/plugins/github/__snapshots__/api.test.js.snap b/src/plugins/github/__snapshots__/api.test.js.snap
index 0f64938..fac1948 100644
--- a/src/plugins/github/__snapshots__/api.test.js.snap
+++ b/src/plugins/github/__snapshots__/api.test.js.snap
@@ -49,7 +49,7 @@ Object {
 }
 `;
 
-exports[`GitHub porcelain API has wrappers for PullRequests 1`] = `
+exports[`GitHub porcelain API has wrappers for PullRequests Merged 1`] = `
 Object {
   "address": Object {
     "id": "https://github.com/sourcecred/example-github/pull/3",
diff --git a/src/plugins/github/__snapshots__/parser.test.js.snap b/src/plugins/github/__snapshots__/parser.test.js.snap
index 08b00e3..fa308b4 100644
--- a/src/plugins/github/__snapshots__/parser.test.js.snap
+++ b/src/plugins/github/__snapshots__/parser.test.js.snap
@@ -199,6 +199,21 @@ Object {
         "type": "PULL_REQUEST_REVIEW",
       },
     },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/pull/5\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"PULL_REQUEST\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"6d5b3aa31ebb68a06ceb46bbd6cf49b6ccd6f5e6\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/git-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"COMMIT\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"MERGED_AS\\"}": Object {
+      "dst": Object {
+        "id": "6d5b3aa31ebb68a06ceb46bbd6cf49b6ccd6f5e6",
+        "pluginName": "sourcecred/git-beta",
+        "type": "COMMIT",
+      },
+      "payload": Object {
+        "hash": "6d5b3aa31ebb68a06ceb46bbd6cf49b6ccd6f5e6",
+      },
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github/pull/5",
+        "pluginName": "sourcecred/github-beta",
+        "type": "PULL_REQUEST",
+      },
+    },
     "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/pull/5\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"PULL_REQUEST\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/pull/5#pullrequestreview-100313899\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"PULL_REQUEST_REVIEW\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
       "dst": Object {
         "id": "https://github.com/sourcecred/example-github/pull/5#pullrequestreview-100313899",
@@ -358,6 +373,21 @@ Object {
         "type": "PULL_REQUEST",
       },
     },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/pull/3\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"PULL_REQUEST\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"0a223346b4e6dec0127b1e6aa892c4ee0424b66a\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/git-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"COMMIT\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"MERGED_AS\\"}": Object {
+      "dst": Object {
+        "id": "0a223346b4e6dec0127b1e6aa892c4ee0424b66a",
+        "pluginName": "sourcecred/git-beta",
+        "type": "COMMIT",
+      },
+      "payload": Object {
+        "hash": "0a223346b4e6dec0127b1e6aa892c4ee0424b66a",
+      },
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github/pull/3",
+        "pluginName": "sourcecred/github-beta",
+        "type": "PULL_REQUEST",
+      },
+    },
     "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/pull/3\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"PULL_REQUEST\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/pull/3#issuecomment-369162222\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"COMMENT\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
       "dst": Object {
         "id": "https://github.com/sourcecred/example-github/pull/3#issuecomment-369162222",
@@ -1830,6 +1860,21 @@ Object {
         "type": "COMMENT",
       },
     },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/pull/3\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"PULL_REQUEST\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"0a223346b4e6dec0127b1e6aa892c4ee0424b66a\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/git-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"COMMIT\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"MERGED_AS\\"}": Object {
+      "dst": Object {
+        "id": "0a223346b4e6dec0127b1e6aa892c4ee0424b66a",
+        "pluginName": "sourcecred/git-beta",
+        "type": "COMMIT",
+      },
+      "payload": Object {
+        "hash": "0a223346b4e6dec0127b1e6aa892c4ee0424b66a",
+      },
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github/pull/3",
+        "pluginName": "sourcecred/github-beta",
+        "type": "PULL_REQUEST",
+      },
+    },
     "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/pull/3\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"PULL_REQUEST\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/pull/3#issuecomment-369162222\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"COMMENT\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
       "dst": Object {
         "id": "https://github.com/sourcecred/example-github/pull/3#issuecomment-369162222",
@@ -1856,6 +1901,21 @@ Object {
         "type": "PULL_REQUEST_REVIEW",
       },
     },
+    "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/pull/5\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"PULL_REQUEST\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"6d5b3aa31ebb68a06ceb46bbd6cf49b6ccd6f5e6\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/git-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"COMMIT\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"MERGED_AS\\"}": Object {
+      "dst": Object {
+        "id": "6d5b3aa31ebb68a06ceb46bbd6cf49b6ccd6f5e6",
+        "pluginName": "sourcecred/git-beta",
+        "type": "COMMIT",
+      },
+      "payload": Object {
+        "hash": "6d5b3aa31ebb68a06ceb46bbd6cf49b6ccd6f5e6",
+      },
+      "src": Object {
+        "id": "https://github.com/sourcecred/example-github/pull/5",
+        "pluginName": "sourcecred/github-beta",
+        "type": "PULL_REQUEST",
+      },
+    },
     "{\\"id\\":\\"[{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/pull/5\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"PULL_REQUEST\\\\\\"},{\\\\\\"id\\\\\\":\\\\\\"https://github.com/sourcecred/example-github/pull/5#pullrequestreview-100313899\\\\\\",\\\\\\"pluginName\\\\\\":\\\\\\"sourcecred/github-beta\\\\\\",\\\\\\"type\\\\\\":\\\\\\"PULL_REQUEST_REVIEW\\\\\\"}]\\",\\"pluginName\\":\\"sourcecred/github-beta\\",\\"type\\":\\"CONTAINS\\"}": Object {
       "dst": Object {
         "id": "https://github.com/sourcecred/example-github/pull/5#pullrequestreview-100313899",
diff --git a/src/plugins/github/api.js b/src/plugins/github/api.js
index 110a67e..95c5941 100644
--- a/src/plugins/github/api.js
+++ b/src/plugins/github/api.js
@@ -6,31 +6,35 @@ import {Graph} from "../../core/graph";
 import type {Node} from "../../core/graph";
 import type {Address} from "../../core/address";
 import type {
-  NodePayload,
-  EdgePayload,
-  NodeType,
-  IssueNodePayload,
-  PullRequestNodePayload,
-  PullRequestReviewNodePayload,
-  PullRequestReviewCommentNodePayload,
-  PullRequestReviewState,
-  CommentNodePayload,
   AuthorNodePayload,
   AuthorSubtype,
+  CommentNodePayload,
+  EdgePayload,
+  IssueNodePayload,
+  MergedAsEdgePayload,
+  NodePayload,
+  NodeType,
+  PullRequestNodePayload,
+  PullRequestReviewCommentNodePayload,
+  PullRequestReviewNodePayload,
+  PullRequestReviewState,
 } from "./types";
 
 import {
-  CONTAINS_EDGE_TYPE,
-  COMMENT_NODE_TYPE,
   AUTHORS_EDGE_TYPE,
   AUTHOR_NODE_TYPE,
+  COMMENT_NODE_TYPE,
+  CONTAINS_EDGE_TYPE,
   ISSUE_NODE_TYPE,
+  MERGED_AS_EDGE_TYPE,
   PULL_REQUEST_NODE_TYPE,
-  PULL_REQUEST_REVIEW_NODE_TYPE,
   PULL_REQUEST_REVIEW_COMMENT_NODE_TYPE,
+  PULL_REQUEST_REVIEW_NODE_TYPE,
   REFERENCES_EDGE_TYPE,
 } from "./types";
 
+import {COMMIT_NODE_TYPE} from "../git/types";
+
 export type Entity =
   | Issue
   | PullRequest
@@ -221,6 +225,25 @@ export class PullRequest extends Commentable<PullRequestNodePayload> {
       })
       .map(({neighbor}) => new PullRequestReview(this.graph, neighbor));
   }
+  mergeCommitHash(): ?string {
+    const mergeEdge = this.graph
+      .neighborhood(this.nodeAddress, {
+        edgeType: MERGED_AS_EDGE_TYPE,
+        nodeType: COMMIT_NODE_TYPE,
+        direction: "OUT",
+      })
+      .map(({edge}) => edge);
+    if (mergeEdge.length > 1) {
+      throw new Error(
+        `Node at ${this.nodeAddress.id} has too many MERGED_AS edges`
+      );
+    }
+    if (mergeEdge.length === 0) {
+      return null;
+    }
+    const payload: MergedAsEdgePayload = (mergeEdge[0].payload: any);
+    return payload.hash;
+  }
 }
 
 export class Issue extends Commentable<IssueNodePayload> {
diff --git a/src/plugins/github/api.test.js b/src/plugins/github/api.test.js
index 60b2553..c7bc348 100644
--- a/src/plugins/github/api.test.js
+++ b/src/plugins/github/api.test.js
@@ -35,18 +35,26 @@ describe("GitHub porcelain API", () => {
       expect(issue.address()).toEqual(issue.node().address);
       expect(issue.authors().map((x) => x.login())).toEqual(["decentralion"]);
     });
-
-    it("PullRequests", () => {
-      const pullRequest = issueOrPRByNumber(3);
-      expect(pullRequest.body()).toBe("Oh look, it's a pull request.");
-      expect(pullRequest.title()).toBe("Add README, merge via PR.");
-      expect(pullRequest.url()).toBe(
-        "https://github.com/sourcecred/example-github/pull/3"
-      );
-      expect(pullRequest.number()).toBe(3);
-      expect(pullRequest.type()).toBe(PULL_REQUEST_NODE_TYPE);
-      expect(pullRequest.node()).toMatchSnapshot();
-      expect(pullRequest.address()).toEqual(pullRequest.node().address);
+    describe("PullRequests", () => {
+      it("Merged", () => {
+        const pullRequest = PullRequest.from(issueOrPRByNumber(3));
+        expect(pullRequest.body()).toBe("Oh look, it's a pull request.");
+        expect(pullRequest.title()).toBe("Add README, merge via PR.");
+        expect(pullRequest.url()).toBe(
+          "https://github.com/sourcecred/example-github/pull/3"
+        );
+        expect(pullRequest.number()).toBe(3);
+        expect(pullRequest.type()).toBe(PULL_REQUEST_NODE_TYPE);
+        expect(pullRequest.node()).toMatchSnapshot();
+        expect(pullRequest.address()).toEqual(pullRequest.node().address);
+        expect(pullRequest.mergeCommitHash()).toEqual(
+          "0a223346b4e6dec0127b1e6aa892c4ee0424b66a"
+        );
+      });
+      it("Unmerged", () => {
+        const pullRequest = PullRequest.from(issueOrPRByNumber(9));
+        expect(pullRequest.mergeCommitHash()).toEqual(null);
+      });
     });
 
     it("Pull Request Reviews", () => {
diff --git a/src/plugins/github/parser.js b/src/plugins/github/parser.js
index f5a2fe1..1a5ef2b 100644
--- a/src/plugins/github/parser.js
+++ b/src/plugins/github/parser.js
@@ -19,6 +19,7 @@ import type {
   AuthorSubtype,
 } from "./types";
 
+import {MERGED_AS_EDGE_TYPE} from "./types";
 import type {
   RepositoryJSON,
   PullRequestReviewJSON,
@@ -32,6 +33,7 @@ import type {Address} from "../../core/address";
 import {PLUGIN_NAME} from "./pluginName";
 import {Graph, edgeID} from "../../core/graph";
 import {findReferences} from "./findReferences";
+import {commitAddress} from "../git/address";
 
 export function parse(
   repositoryJSON: RepositoryJSON
@@ -217,6 +219,22 @@ class GithubParser {
     prJson.reviews.nodes.forEach((r) =>
       this.addPullRequestReview(pullRequestNode, r)
     );
+
+    if (prJson.mergeCommit != null) {
+      const hash = prJson.mergeCommit.oid;
+      const dstAddr = commitAddress(hash);
+      const mergedAsEdge = {
+        address: this.makeEdgeAddress(
+          MERGED_AS_EDGE_TYPE,
+          pullRequestNode.address,
+          dstAddr
+        ),
+        payload: {hash},
+        src: pullRequestNode.address,
+        dst: dstAddr,
+      };
+      this.graph.addEdge(mergedAsEdge);
+    }
   }
 
   addPullRequestReview(
diff --git a/src/plugins/github/types.js b/src/plugins/github/types.js
index 55a0a1f..534fcd4 100644
--- a/src/plugins/github/types.js
+++ b/src/plugins/github/types.js
@@ -98,6 +98,8 @@ export type AuthorsEdgePayload = {};
 export const AUTHORS_EDGE_TYPE: "AUTHORS" = "AUTHORS";
 export type ContainsEdgePayload = {};
 export const CONTAINS_EDGE_TYPE: "CONTAINS" = "CONTAINS";
+export type MergedAsEdgePayload = {|+hash: string|};
+export const MERGED_AS_EDGE_TYPE: "MERGED_AS" = "MERGED_AS";
 export type ReferencesEdgePayload = {};
 export const REFERENCES_EDGE_TYPE: "REFERENCES" = "REFERENCES";
 
@@ -110,6 +112,10 @@ export type EdgeTypes = {|
     payload: ContainsEdgePayload,
     type: typeof CONTAINS_EDGE_TYPE,
   },
+  MERGED_AS: {
+    payload: MergedAsEdgePayload,
+    type: typeof MERGED_AS_EDGE_TYPE,
+  },
   REFERENCES: {
     payload: ReferencesEdgePayload,
     type: typeof REFERENCES_EDGE_TYPE,
@@ -119,6 +125,7 @@ export type EdgeTypes = {|
 export type EdgeType =
   | typeof AUTHORS_EDGE_TYPE
   | typeof CONTAINS_EDGE_TYPE
+  | typeof MERGED_AS_EDGE_TYPE
   | typeof REFERENCES_EDGE_TYPE;
 
 export type EdgePayload =