diff --git a/src/aquarius/Aquarius.ts b/src/aquarius/Aquarius.ts
index d6984f8..cd52a2f 100644
--- a/src/aquarius/Aquarius.ts
+++ b/src/aquarius/Aquarius.ts
@@ -22,7 +22,7 @@ export interface SearchQuery {
 }
 
 /**
- * Provides a interface with Aquarius.
+ * Provides an interface with Aquarius.
  * Aquarius provides an off-chain database store for metadata about data assets.
  */
 export class Aquarius {
@@ -34,7 +34,12 @@ export class Aquarius {
         return this.aquariusUri
     }
 
-    constructor(aquariusUri: string, logger?: Logger) {
+    /**
+     * Instantiate Aquarius (independently of Ocean) for off-chain interaction.
+     * @param {String} aquariusUri
+     * @param {Logger} logger
+     */
+    constructor(aquariusUri: string, logger: Logger) {
         this.fetch = new WebServiceConnector(logger)
         this.logger = logger
         this.aquariusUri = aquariusUri