diff --git a/commands/capabilities/exported.go b/commands/capabilities/exported.go
new file mode 100644
index 0000000..d7b8fa1
--- /dev/null
+++ b/commands/capabilities/exported.go
@@ -0,0 +1,44 @@
+package capabilities
+
+import (
+	// stdlib
+	"log"
+
+	// local
+	"develop.pztrn.name/gonews/gonews/eventer"
+	"develop.pztrn.name/gonews/gonews/networker"
+)
+
+var capabilities = []string{
+	"VERSION 2",
+}
+
+func Initialize() {
+	log.Println("Initializing capabilities command...")
+
+	eventer.AddEventHandler(&eventer.EventHandler{
+		Command: "internal/capability_add",
+		Handler: addCapability,
+	})
+
+	eventer.AddEventHandler(&eventer.EventHandler{
+		Command: "commands/capabilities",
+		Handler: handler,
+	})
+}
+
+func addCapability(data interface{}) interface{} {
+	capabilities = append(capabilities, data.(string))
+
+	return nil
+}
+
+func handler(data interface{}) interface{} {
+	dataToReturn := "Capability list:\r\n"
+
+	for _, cap := range capabilities {
+		dataToReturn += cap + "\r\n"
+	}
+	dataToReturn += ".\r\n"
+	return &networker.Reply{Code: "101", Data: dataToReturn}
+}
diff --git a/commands/exported.go b/commands/exported.go
index d2e02e8..5d7aa83 100644
--- a/commands/exported.go
+++ b/commands/exported.go
@@ -5,6 +5,7 @@ import (
 	"log"
 
 	// local
+	"develop.pztrn.name/gonews/gonews/commands/capabilities"
 	"develop.pztrn.name/gonews/gonews/commands/greeting"
 	"develop.pztrn.name/gonews/gonews/commands/quit"
 )
@@ -14,4 +15,5 @@ func Initialize() {
 
 	greeting.Initialize()
 	quit.Initialize()
+	capabilities.Initialize()
 }
diff --git a/doc/implementation.md b/doc/implementation.md
index 0192ee4..3bb2448 100644
--- a/doc/implementation.md
+++ b/doc/implementation.md
@@ -13,10 +13,10 @@ This document will be updated with new RFCs data in process of development.
 RFC3977:
 
 * [ ] Connection handling ([section 5](https://tools.ietf.org/html/rfc3977#section-5)):
-    * [ ] Concurrent connection handling
-    * [ ] CAPABILITIES command ([section 5.2](https://tools.ietf.org/html/rfc3977#section-5.2))
+    * [x] Concurrent connection handling
+    * [x] CAPABILITIES command ([section 5.2](https://tools.ietf.org/html/rfc3977#section-5.2))
     * [ ] MODE command ([section 5.3](https://tools.ietf.org/html/rfc3977#section-5.3))
-    * [ ] QUIT command ([section 5.4](https://tools.ietf.org/html/rfc3977#section-5.4))
+    * [x] QUIT command ([section 5.4](https://tools.ietf.org/html/rfc3977#section-5.4))
 * [ ] Article retrieval and posting, working with groups ([section 6](https://tools.ietf.org/html/rfc3977#section-6)):
     * [ ] Group selection and information retrieval ([section 6.1.1](https://tools.ietf.org/html/rfc3977#section-6.1.1))
     * [ ] Group selection and information retrieval with articles numbers ([section 6.1.2](https://tools.ietf.org/html/rfc3977#section-6.1.2))
diff --git a/networker/connection.go b/networker/connection.go
index 6701553..f97eaec 100644
--- a/networker/connection.go
+++ b/networker/connection.go
@@ -57,7 +57,7 @@ func connectionWorker(conn net.Conn) {
 		// ToDo: what if we'll upload binary data here?
 		// Not supported yet.
 		data := strings.Split(scanr.Text(), " ")
-		replyRaw, err := eventer.LaunchEvent("commands/"+data[0], data[1:])
+		replyRaw, err := eventer.LaunchEvent("commands/"+strings.ToLower(data[0]), data[1:])
 		if err != nil {
 			// We won't break here as this is just logging of appeared error.
 			log.Println("Error appeared while processing command '" + data[0] + "' for " + remoteAddr.String() + ": " + err.Error())