diff --git a/rocrate/model/metadata.py b/rocrate/model/metadata.py
index f4ddb50..49f4aa8 100644
--- a/rocrate/model/metadata.py
+++ b/rocrate/model/metadata.py
@@ -47,6 +47,7 @@ def __init__(self, crate, source=None, dest_path=None, properties=None):
             properties=properties
         )
         # https://www.researchobject.org/ro-crate/1.1/appendix/jsonld.html#extending-ro-crate
+        self.extra_contexts = []
         self.extra_terms = {}
 
     def _empty(self):
@@ -63,9 +64,12 @@ def generate(self):
         graph = []
         for entity in self.crate.get_entities():
             graph.append(entity.properties())
-        context = f'{self.PROFILE}/context'
+        context = [f'{self.PROFILE}/context']
+        context.extend(self.extra_contexts)
         if self.extra_terms:
-            context = [context, self.extra_terms]
+            context.append(self.extra_terms)
+        if len(context) == 1:
+            context = context[0]
         return {'@context': context, '@graph': graph}
 
     def write(self, base_path):
diff --git a/test/test_model.py b/test/test_model.py
index 2830ec1..0324d90 100644
--- a/test/test_model.py
+++ b/test/test_model.py
@@ -460,3 +460,18 @@ def test_get_by_type(test_data_dir):
     assert crate.get_by_type(["File", "ComputationalWorkflow"]) == [wf]
     assert crate.get_by_type("Person") == []
     assert crate.get_by_type("Dataset") == [crate.root_dataset]
+
+
+def test_context(helpers):
+    crate = ROCrate()
+    jsonld = crate.metadata.generate()
+    base_context = f"{helpers.PROFILE}/context"
+    assert jsonld["@context"] == base_context
+    wfrun_ctx = "https://w3id.org/ro/terms/workflow-run"
+    crate.metadata.extra_contexts.append(wfrun_ctx)
+    jsonld = crate.metadata.generate()
+    assert jsonld["@context"] == [base_context, wfrun_ctx]
+    k, v = "runsOn", "https://w3id.org/ro/terms/test#runsOn"
+    crate.metadata.extra_terms[k] = v
+    jsonld = crate.metadata.generate()
+    assert jsonld["@context"] == [base_context, wfrun_ctx, {k: v}]