diff --git a/src/domain/model/Operation.spec.ts b/src/domain/model/Operation.spec.ts
index b2b8399..cf06bb7 100644
--- a/src/domain/model/Operation.spec.ts
+++ b/src/domain/model/Operation.spec.ts
@@ -27,6 +27,19 @@ describe(Operation, () => {
     })
   })
 
+  describe('create with valid arguments', () => {
+    const validUnusualCases = [
+      { caseID: `with ':'`, path: '/foo/:id' },
+      { caseID: `with '?' and '='`, path: '/foo?key=value' },
+    ]
+
+    validUnusualCases.forEach(({ caseID, path }) => {
+      test(`${caseID} doesn't throw error`, () => {
+        expect(() => Operation.create(HTTPVerb.GET, path)).not.toThrow()
+      })
+    })
+  })
+
   describe('create with invalid arguments throwing InvalidStateError', () => {
     test('when verb is a string not from the enum', () => {
       // @ts-ignore
@@ -40,7 +53,6 @@ describe(Operation, () => {
 
     const cases = [
       { id: 'with spaces', path: '/foo /bar' },
-      { id: 'with invalid chars', path: '/foo?bar' },
       { id: 'without leading forward-slash', path: 'foo/bar' },
       { id: 'with trailling forward-slash', path: '/foo/bar/' },
     ]
diff --git a/src/domain/model/Operation.ts b/src/domain/model/Operation.ts
index c5f63e6..59406ad 100644
--- a/src/domain/model/Operation.ts
+++ b/src/domain/model/Operation.ts
@@ -15,7 +15,7 @@ export class Operation {
     const validVerb = verbs.includes(verb)
     if (!validVerb) throw new InvalidStateError(`http verb must be one of: ${verbs.join(', ')}`)
 
-    const rgx = /^(\/[A-Za-z0-9\-_]+)+$/
+    const rgx = /^(\/[A-Za-z0-9\-_:]+)+(\?[A-Za-z0-9\-_=&\[\]]+)?$/
     const validPath = rgx.test(path)
 
     if (!validPath) throw new InvalidStateError('path must be of format /foo/baz/123, got ' + path)