diff --git a/src/python/dxpy/cli/org.py b/src/python/dxpy/cli/org.py
index <HASH>..<HASH> 100644
--- a/src/python/dxpy/cli/org.py
+++ b/src/python/dxpy/cli/org.py
@@ -74,7 +74,7 @@ def add_membership(args):
     except:
         pass
     else:
-        raise DXCLIError("Cannot add a user who is already a member of the org")
+        raise DXCLIError("Cannot add a user who is already a member of the org. To update an existing member's permissions, use 'dx update member'")
 
     dxpy.api.org_invite(args.org_id, get_org_invite_args(user_id, args))
Add more informative error message for `dx add member`.

Recommend that the user executes `dx update member` if the user executed `dx
add member` on a user who is already a member.