diff --git a/packages/custom-functions-metadata/src/parseTree.ts b/packages/custom-functions-metadata/src/parseTree.ts
index f06ac59f2..f12375118 100644
--- a/packages/custom-functions-metadata/src/parseTree.ts
+++ b/packages/custom-functions-metadata/src/parseTree.ts
@@ -30,6 +30,7 @@ export interface IFunctionOptions {
   excludeFromAutoComplete?: boolean;
   linkedEntityLoadService?: boolean;
   capturesCallingObject?: boolean;
+  supportSync?: boolean;
 }
 
 export interface IFunctionParameter {
@@ -132,6 +133,7 @@ const REQUIRESADDRESS = "requiresaddress";
 const REQUIRESPARAMETERADDRESSES = "requiresparameteraddresses";
 const STREAMING = "streaming";
 const VOLATILE = "volatile";
+const SUPPORT_SYNC = "supportsync";
 
 const TYPE_MAPPINGS = {
   [ts.SyntaxKind.NumberKeyword]: "number",
@@ -462,7 +464,8 @@ export function parseTree(sourceCode: string, sourceFileName: string): IParseTre
             !options.requiresStreamParameterAddresses &&
             !options.excludeFromAutoComplete &&
             !options.linkedEntityLoadService &&
-            !options.capturesCallingObject
+            !options.capturesCallingObject &&
+            !options.supportSync
           ) {
             delete functionMetadata.options;
           } else {
@@ -505,6 +508,10 @@ export function parseTree(sourceCode: string, sourceFileName: string): IParseTre
             if (!options.capturesCallingObject) {
               delete options.capturesCallingObject;
             }
+
+            if (!options.supportSync) {
+              delete options.supportSync;
+            }
           }
 
           if (!functionMetadata.helpUrl) {
@@ -667,6 +674,7 @@ function getOptions(
     excludeFromAutoComplete: isExcludedFromAutoComplete(func),
     linkedEntityLoadService: isLinkedEntityLoadService(func),
     capturesCallingObject: capturesCallingObject(func),
+    supportSync: supportSync(func),
   };
 
   if (isAddressRequired(func) || isRequiresParameterAddresses(func)) {
@@ -1062,6 +1070,14 @@ function capturesCallingObject(node: ts.Node): boolean {
   return hasTag(node, CAPTURESCALLINGOBJECT);
 }
 
+/**
+ * Returns true if sync tag found in comments
+ * @param node jsDocs node
+ */
+function supportSync(node: ts.Node): boolean {
+  return hasTag(node, SUPPORT_SYNC);
+}
+
 function containsTag(tag: ts.JSDocTag, tagName: string): boolean {
   return (tag.tagName.escapedText as string).toLowerCase() === tagName;
 }