diff --git a/lib/contracts/contributor.js b/lib/contracts/contributor.js
index 94d4921..1845730 100644
--- a/lib/contracts/contributor.js
+++ b/lib/contracts/contributor.js
@@ -34,7 +34,7 @@ class Contributor extends Base {
       });
   }
 
-  add(contributorAttr) {
+  add(contributorAttr, callOptions = {}) {
     let json = ContributorSerializer.serialize(contributorAttr);
     // TODO: validate against schema
 
@@ -49,7 +49,7 @@ class Contributor extends Base {
           contributorAttr.isCore,
         ];
 
-        return this.functions.addContributor(...contributor);
+        return this.functions.addContributor(...contributor, callOptions);
       });
   }
 }
diff --git a/lib/contracts/operator.js b/lib/contracts/operator.js
index bcb31b8..83a5eae 100644
--- a/lib/contracts/operator.js
+++ b/lib/contracts/operator.js
@@ -34,7 +34,7 @@ class Operator extends Base {
       });
   }
 
-  addProposal(proposalAttr) {
+  addProposal(proposalAttr, callOptions = {}) {
     let json = ContributionSerializer.serialize(proposalAttr);
     // TODO: validate against schema
 
@@ -49,7 +49,7 @@ class Operator extends Base {
           ipfsHashAttr.hashSize,
         ];
 
-        return this.functions.addProposal(...proposal);
+        return this.functions.addProposal(...proposal, callOptions);
       });
   }
 }