diff --git a/EIPS/eip-1261.md b/EIPS/eip-1261.md
index 732faeab..132383e5 100644
--- a/EIPS/eip-1261.md
+++ b/EIPS/eip-1261.md
@@ -94,7 +94,7 @@ interface IERC1261 {/* is ERC173, ERC165 */
     ///  Contract can set a max number of attributes and throw if limit is reached.
     /// @param _name Name of the attribute which is to be added.
     /// @param values List of values of the specified attribute.
-    function addAttributeSet(bytes32 _name, bytes32[] values) external;
+    function addAttributeSet(bytes32 _name, bytes32[] calldata values) external;
 
     /// @notice Modifies the attribute value of a specific attribute for a given `_to` address.
     /// @dev Use appropriate checks for whether a user/admin can modify the data.
@@ -112,7 +112,7 @@ interface IERC1261 {/* is ERC173, ERC165 */
     ///  dev can also oraclize the request to assign membership later
     /// @param _attributeIndexes the attribute data associated with the member.
     ///  This is an array which contains indexes of attributes.
-    function requestMembership(uint[] _attributeIndexes) external payable;
+    function requestMembership(uint[] calldata _attributeIndexes) external payable;
 
     /// @notice User can forfeit his membership.
     /// @dev Throws if the `msg.sender` already doesn't have the token.
@@ -146,7 +146,7 @@ interface IERC1261 {/* is ERC173, ERC165 */
     /// @param _to The address to which the token is assigned.
     /// @param _attributeIndexes The attribute data associated with the member.
     ///  This is an array which contains indexes of attributes.
-    function assignTo(address _to, uint[] _attributeIndexes) external;
+    function assignTo(address _to, uint[] calldata _attributeIndexes) external;
 
     /// @notice Only Owner can revoke the membership.
     /// @dev This removes the membership of the user.
@@ -168,7 +168,7 @@ interface IERC1261 {/* is ERC173, ERC165 */
     /// @dev Returns the values of attributes as a bytes32 array.
     /// @param _name Name of the attribute whose values are to be fetched
     /// @return The values of attributes.
-    function getAttributeExhaustiveCollection(bytes32 _name) external view returns (bytes32[]);
+    function getAttributeExhaustiveCollection(bytes32 _name) external view returns (bytes32[] memory);
 
     /// @notice Returns the list of all past and present members.
     /// @dev Use this function along with isCurrentMember to find wasMemberOf() in Js.
@@ -190,7 +190,7 @@ interface IERC1261 {/* is ERC173, ERC165 */
     ///  Which has a single attributeValue for each attributeName in an array.
     ///  Use web3.toAscii(data[0]).replace(/\u0000/g, "") to convert to string in JS.
     /// @return The names of attributes.
-    function getAttributeNames() external view returns (bytes32[]);
+    function getAttributeNames() external view returns (bytes32[] memory);
 
     /// @notice Returns the attributes of `_to` address.
     /// @dev Throws if `_to` is the zero address.
@@ -215,7 +215,7 @@ interface ERC173 /* is ERC165 */ {
 
     /// @notice Get the address of the owner
     /// @return The address of the owner.
-    function owner() view external;
+    function owner() external view;
 
     /// @notice Set the address of the new owner of the contract
     /// @param _newOwner The address of the new owner of the contract