diff --git a/ideaboard.txt b/ideaboard.txt
index 710bac9..850e43e 100644
--- a/ideaboard.txt
+++ b/ideaboard.txt
@@ -1,7 +1,6 @@
 Concepts / Language Features
 =====
 new record syntax
-Agents
 Vars
 state identity lifetime
 Metadata
diff --git a/resources/koans.clj b/resources/koans.clj
index c461f60..eefe531 100644
--- a/resources/koans.clj
+++ b/resources/koans.clj
@@ -208,4 +208,4 @@
                      10
                      10
                      12
-                     IllegalStateException]}]]
+                     12]}]]
diff --git a/src/koans/21_agents.clj b/src/koans/21_agents.clj
index 1806f2d..4b02fd1 100644
--- a/src/koans/21_agents.clj
+++ b/src/koans/21_agents.clj
@@ -9,23 +9,23 @@
   "To get agent's value you dereference it"
   (= __ @agent-example)
 
-  "To set a new value, you use send or send-all functions, but you can't just send anything.."
-  (= __ (do
-          (set-error-mode! agent-example :continue)
-          (send agent-example 20)
-          @agent-example))
-
-  "Send takes a function and arguments and sends them to the agent. The send function,
-   returns immediately, but the action is prccessed in a separate thread and it's the result,
+  "To change agent's value you use send function - you pass action and action's arguments to it.
+   Send function, returns immediately, but the action is prccessed in a separate thread and it's the result,
    of that action that gets assigned to agent's state"
   (= __ (do
           (send agent-example + 2)
           @agent-example))
 
+  "You can't just send a value to agent"
+  (= __ (do
+          (set-error-mode! agent-example :continue)
+          (send agent-example 20)
+          @agent-example))
+
   "You can create validations for states that agent is allowed to take"
   (= __ (do
           (set-validator! agent-example #(even? %))
           (try
             (send agent-example + 1)
             (catch IllegalStateException e))
-          (agent-error agent-example))))
+          @agent-example)))