diff --git a/src/interface.jl b/src/interface.jl
index a954cbe..b1e8503 100644
--- a/src/interface.jl
+++ b/src/interface.jl
@@ -6,6 +6,23 @@ using CUDA
 
 # ------------------------------ 100 characters ------------------------------ #
 
+""" Search wine in stock.
+
+  Arguments\n
+    a : one of ChatAgent's agent.
+    
+  Return\n
+    A JSON string of available wine
+
+  Example\n
+  ```jldoctest
+  julia> using ChatAgent, CommUtils
+  julia> agent = ChatAgent.agentReflex("Jene")
+  julia> input = "{\"food\": \"pizza\", \"occasion\": \"anniversary\"}"
+  julia> result = winestock(agent, input)
+  "{"wine 1": {\"Winery\": \"Pichon Baron\", \"wine name\": \"Pauillac (Grand Cru Classé)\", \"grape variety\": \"Cabernet Sauvignon\", \"year\": 2010, \"price\": \"125 USD\", \"stock ID\": \"ar-17\"}, }"
+  ```
+"""
 cartesianAssign!(a::CuArray, b::CuArray) = @cuda cartesianAssign!(a, b)