diff --git a/lib/getWorkflow.js b/lib/getWorkflow.js
index 520637a..4371ad1 100644
--- a/lib/getWorkflow.js
+++ b/lib/getWorkflow.js
@@ -1,5 +1,13 @@
 'use strict';
 
+/**
+ * Remove the ~ prefix for logical OR on select node names.
+ * @method filterNodeName
+ * @param  {String}       name A Node Name, e.g. foo, ~foo, ~pr, ~commit, ~sd@1234:foo
+ * @return {String}            A filtered node name, e.g. foo, foo, ~pr, ~commit, ~sd@1234:foo
+ */
+const filterNodeName = name => (/^~(pr|commit|sd@)/.test(name) ? name : name.replace('~', ''));
+
 /**
  * Get the list of nodes for the graph
  * @method calculateNodes
@@ -7,16 +15,16 @@
  * @return {Array}             List of nodes (jobs)
  */
 const calculateNodes = (jobs) => {
-    const nodes = [
-        { name: '~pr' },
-        { name: '~commit' }
-    ];
+    const nodes = new Set(['~pr', '~commit']);
 
     Object.keys(jobs).forEach((name) => {
-        nodes.push({ name });
+        nodes.add(name);
+        if (Array.isArray(jobs[name].requires)) {
+            jobs[name].requires.forEach(n => nodes.add(filterNodeName(n)));
+        }
     });
 
-    return nodes;
+    return [...nodes].map(name => ({ name }));
 };
 
 /**
@@ -57,12 +65,12 @@ const calculateEdges = (jobs) => {
         const dest = j;
 
         if (Array.isArray(job.requires)) {
-            const specialTriggers = job.requires.filter(name => name.charAt(0) === '~');
-            const normalTriggers = job.requires.filter(name => name.charAt(0) !== '~');
-            const isJoin = normalTriggers.length > 1;
+            const specialTriggers = new Set(job.requires.filter(name => name.charAt(0) === '~'));
+            const normalTriggers = new Set(job.requires.filter(name => name.charAt(0) !== '~'));
+            const isJoin = normalTriggers.size > 1;
 
             specialTriggers.forEach((src) => {
-                edges.push({ src, dest });
+                edges.push({ src: filterNodeName(src), dest });
             });
 
             normalTriggers.forEach((src) => {
diff --git a/test/data/expected-external.json b/test/data/expected-external.json
new file mode 100644
index 0000000..70d913a
--- /dev/null
+++ b/test/data/expected-external.json
@@ -0,0 +1,17 @@
+{
+    "nodes": [
+        { "name": "~pr" },
+        { "name": "~commit" },
+        { "name": "main" },
+        { "name": "foo" },
+        { "name": "bar" },
+        { "name": "~sd@1234:foo" }
+    ],
+    "edges": [
+        { "src": "~pr", "dest": "main" },
+        { "src": "~commit", "dest": "main" },
+        { "src": "main", "dest": "foo" },
+        { "src": "~sd@1234:foo", "dest": "bar" },
+        { "src": "foo", "dest": "bar" }
+    ]
+}
diff --git a/test/data/requires-workflow-exttrigger.json b/test/data/requires-workflow-exttrigger.json
new file mode 100644
index 0000000..e2b512c
--- /dev/null
+++ b/test/data/requires-workflow-exttrigger.json
@@ -0,0 +1,7 @@
+{
+    "jobs": {
+        "main": { "requires": ["~pr", "~commit"] },
+        "foo": { "requires": ["main"] },
+        "bar": { "requires": ["foo", "~sd@1234:foo"] }
+    }
+}
diff --git a/test/lib/getWorkflow.test.js b/test/lib/getWorkflow.test.js
index 80b9496..7c16971 100644
--- a/test/lib/getWorkflow.test.js
+++ b/test/lib/getWorkflow.test.js
@@ -13,8 +13,11 @@ const LEGACY_AND_REQUIRES_WORKFLOW = Object.assign({}, REQUIRES_WORKFLOW);
 
 LEGACY_WITH_WORKFLOW.workflow = ['foo', 'bar'];
 
+const EXTERNAL_TRIGGER = require('../data/requires-workflow-exttrigger');
+
 const EXPECTED_OUTPUT = require('../data/expected-output');
 const NO_EDGES = Object.assign({}, EXPECTED_OUTPUT);
+const EXPECTED_EXTERNAL = require('../data/expected-external');
 
 NO_EDGES.edges = [];
 
@@ -34,6 +37,9 @@ describe('getWorkflow', () => {
         assert.deepEqual(getWorkflow(REQUIRES_WORKFLOW, {
             useLegacy: true
         }), EXPECTED_OUTPUT, 'requires-style workflow');
+        assert.deepEqual(getWorkflow(EXTERNAL_TRIGGER, {
+            useLegacy: true
+        }), EXPECTED_EXTERNAL, 'requires-style workflow with external trigger');
         assert.deepEqual(getWorkflow(LEGACY_AND_REQUIRES_WORKFLOW, {
             useLegacy: true
         }), EXPECTED_OUTPUT, 'both legacy and non-legacy workflows');
@@ -51,6 +57,8 @@ describe('getWorkflow', () => {
             EXPECTED_OUTPUT, 'requires-style workflow');
         assert.deepEqual(getWorkflow(LEGACY_AND_REQUIRES_WORKFLOW),
             EXPECTED_OUTPUT, 'both legacy and non-legacy workflows');
+        assert.deepEqual(getWorkflow(EXTERNAL_TRIGGER),
+            EXPECTED_EXTERNAL, 'requires-style workflow with external trigger');
     });
 
     it('should handle detatched jobs', () => {
@@ -67,6 +75,93 @@ describe('getWorkflow', () => {
         });
     });
 
+    it('should handle logical OR requires', () => {
+        const result = getWorkflow({
+            jobs: {
+                foo: { requires: ['~commit'] },
+                A: { requires: ['foo'] },
+                B: { requires: ['foo'] },
+                C: { requires: ['~A', '~B', '~sd@1234:foo'] }
+            }
+        });
+
+        assert.deepEqual(result, {
+            nodes: [
+                { name: '~pr' },
+                { name: '~commit' },
+                { name: 'foo' },
+                { name: 'A' },
+                { name: 'B' },
+                { name: 'C' },
+                { name: '~sd@1234:foo' }
+            ],
+            edges: [
+                { src: '~commit', dest: 'foo' },
+                { src: 'foo', dest: 'A' },
+                { src: 'foo', dest: 'B' },
+                { src: 'A', dest: 'C' },
+                { src: 'B', dest: 'C' },
+                { src: '~sd@1234:foo', dest: 'C' }
+            ]
+        });
+    });
+
+    it('should handle logical OR and logial AND requires', () => {
+        const result = getWorkflow({
+            jobs: {
+                foo: { requires: ['~commit'] },
+                A: { requires: ['foo'] },
+                B: { requires: ['foo'] },
+                C: { requires: ['~A', '~B', 'D', 'E'] },
+                D: {},
+                E: {}
+            }
+        });
+
+        assert.deepEqual(result, {
+            nodes: [
+                { name: '~pr' },
+                { name: '~commit' },
+                { name: 'foo' },
+                { name: 'A' },
+                { name: 'B' },
+                { name: 'C' },
+                { name: 'D' },
+                { name: 'E' }
+            ],
+            edges: [
+                { src: '~commit', dest: 'foo' },
+                { src: 'foo', dest: 'A' },
+                { src: 'foo', dest: 'B' },
+                { src: 'A', dest: 'C' },
+                { src: 'B', dest: 'C' },
+                { src: 'D', dest: 'C', join: true },
+                { src: 'E', dest: 'C', join: true }
+            ]
+        });
+    });
+
+    it('should dedupe requires', () => {
+        const result = getWorkflow({
+            jobs: {
+                foo: { requires: ['A', 'A', 'A'] },
+                A: {}
+            }
+        });
+
+        assert.deepEqual(result, {
+            nodes: [
+                { name: '~pr' },
+                { name: '~commit' },
+                { name: 'foo' },
+                { name: 'A' }
+            ],
+            edges: [
+                { src: 'A', dest: 'foo' }
+            ]
+        });
+    });
+
     it('should handle joins', () => {
         const result = getWorkflow({
             jobs: {