diff --git a/libdc/include/dc/api.h b/libdc/include/dc/api.h
index 5a826e2..2a5a129 100644
--- a/libdc/include/dc/api.h
+++ b/libdc/include/dc/api.h
@@ -96,6 +96,13 @@ bool dc_api_get_messages(dc_api_t api, dc_account_t login, dc_channel_t c);
 bool dc_api_post_message(dc_api_t api, dc_account_t login,
                          dc_channel_t c, dc_message_t m);
 
+/**
+ * "ack" a channel, meaning that you have read it its contents. You must provide
+ * a message, so that discord knows which message was the last you read.
+ */
+bool dc_api_channel_ack(dc_api_t api, dc_account_t login,
+                        dc_channel_t c, dc_message_t msg);
+
 /**
  * Fetch a list of friends of the login account "login". The friends are stored
  * within the login object.
diff --git a/libdc/include/dc/channel.h b/libdc/include/dc/channel.h
index a65d157..7a7598d 100644
--- a/libdc/include/dc/channel.h
+++ b/libdc/include/dc/channel.h
@@ -67,4 +67,7 @@ void dc_channel_add_messages(dc_channel_t c, dc_message_t *m, size_t s);
 
 bool dc_channel_compare(dc_channel_t a, dc_channel_t b);
 
+bool dc_channel_has_new_messages(dc_channel_t c);
+void dc_channel_mark_read(dc_channel_t c);
+
 #endif
diff --git a/libdc/src/api-channel.c b/libdc/src/api-channel.c
index d84c40b..6075429 100644
--- a/libdc/src/api-channel.c
+++ b/libdc/src/api-channel.c
@@ -2,6 +2,40 @@
 
 #include "internal.h"
 
+bool dc_api_channel_ack(dc_api_t api, dc_account_t login,
+                        dc_channel_t c, dc_message_t m)
+{
+    bool ret = false;
+    char *url = NULL;
+    json_t *reply = NULL, *j = NULL;
+
+    return_if_true(api == NULL || login == NULL ||
+                   c == NULL || m == NULL, false);
+
+    asprintf(&url, "channels/%s/messages/%s/ack",
+             dc_channel_id(c),
+             dc_message_id(m)
+        );
+    goto_if_true(url == NULL, cleanup);
+
+    j = json_object();
+    goto_if_true(j == NULL, cleanup);
+    json_object_set_new(j, "token", json_string(TOKEN(login)));
+
+    reply = dc_api_call_sync(api, "POST", TOKEN(login), url, j);
+    goto_if_true(reply != NULL, cleanup);
+
+    ret = true;
+
+cleanup:
+
+    free(url);
+    json_decref(reply);
+    json_decref(j);
+
+    return ret;
+}
+
 bool dc_api_post_message(dc_api_t api, dc_account_t login,
                          dc_channel_t c, dc_message_t m)
 {
diff --git a/libdc/src/channel.c b/libdc/src/channel.c
index 1eac160..afb1427 100644
--- a/libdc/src/channel.c
+++ b/libdc/src/channel.c
@@ -46,6 +46,7 @@ struct dc_channel_
 
     GHashTable *messages_byid;
     GPtrArray *messages;
+    bool new_messages;
 };
 
 static void dc_channel_free(dc_channel_t c)
@@ -318,6 +319,8 @@ void dc_channel_add_messages(dc_channel_t c, dc_message_t *m, size_t s)
 
         g_hash_table_insert(c->messages_byid, strdup(id), dc_ref(m[i]));
         g_ptr_array_add(c->messages, dc_ref(m[i]));
+
+        c->new_messages = true;
     }
 
     g_ptr_array_sort(c->messages, (GCompareFunc)dc_message_compare);
@@ -329,3 +332,15 @@ bool dc_channel_compare(dc_channel_t a, dc_channel_t b)
     return_if_true(a->id == NULL || b->id == NULL, false);
     return (strcmp(a->id, b->id) == 0);
 }
+
+bool dc_channel_has_new_messages(dc_channel_t c)
+{
+    return_if_true(c == NULL, false);
+    return c->new_messages;
+}
+
+void dc_channel_mark_read(dc_channel_t c)
+{
+    return_if_true(c == NULL,);
+    c->new_messages = false;
+}
diff --git a/ncdc/CMakeLists.txt b/ncdc/CMakeLists.txt
index 5ccfd6d..4b2490d 100644
--- a/ncdc/CMakeLists.txt
+++ b/ncdc/CMakeLists.txt
@@ -13,6 +13,7 @@ SET(SOURCES
   "include/ncdc/mainwindow.h"
   "include/ncdc/ncdc.h"
   "include/ncdc/textview.h"
+  "src/ack.c"
   "src/cmds.c"
   "src/config.c"
   "src/friends.c"
diff --git a/ncdc/include/ncdc/cmds.h b/ncdc/include/ncdc/cmds.h
index 6a1f5fe..01b265f 100644
--- a/ncdc/include/ncdc/cmds.h
+++ b/ncdc/include/ncdc/cmds.h
@@ -30,6 +30,7 @@ bool ncdc_dispatch(ncdc_mainwindow_t n, wchar_t const *s);
  */
 ncdc_commands_t *ncdc_find_cmd(ncdc_commands_t *cmds, wchar_t const *name);
 
+bool ncdc_cmd_ack(ncdc_mainwindow_t n, size_t ac, wchar_t **av, wchar_t const *f);
 bool ncdc_cmd_friends(ncdc_mainwindow_t n, size_t ac, wchar_t **av, wchar_t const *f);
 bool ncdc_cmd_login(ncdc_mainwindow_t n, size_t ac, wchar_t **av, wchar_t const *f);
 bool ncdc_cmd_logout(ncdc_mainwindow_t n, size_t ac, wchar_t **av, wchar_t const *f);
diff --git a/ncdc/src/ack.c b/ncdc/src/ack.c
new file mode 100644
index 0000000..4ccc7c0
--- /dev/null
+++ b/ncdc/src/ack.c
@@ -0,0 +1,33 @@
+#include <ncdc/cmds.h>
+#include <ncdc/ncdc.h>
+
+bool ncdc_cmd_ack(ncdc_mainwindow_t n, size_t ac, wchar_t **av, wchar_t const *f)
+{
+    dc_channel_t c = NULL;
+    dc_message_t m = NULL;
+    bool ret = false;
+
+    if (!is_logged_in()) {
+        return false;
+    }
+
+    c = ncdc_mainwindow_current_channel(n);
+    return_if_true(c == NULL, false);
+    return_if_true(dc_channel_messages(c) == 0, false);
+    m = dc_channel_nth_message(c, dc_channel_messages(c)-1);
+
+
+    ret = dc_api_channel_ack(dc_session_api(current_session),
+                             dc_session_me(current_session),
+                             c, m
+        );
+
+    if (!ret) {
+        LOG(n, L"ack: failed to ack the given channel");
+        return false;
+    }
+
+    dc_channel_mark_read(c);
+
+    return true;
+}
diff --git a/ncdc/src/cmds.c b/ncdc/src/cmds.c
index 7628824..0354c11 100644
--- a/ncdc/src/cmds.c
+++ b/ncdc/src/cmds.c
@@ -1,13 +1,15 @@
 #include <ncdc/cmds.h>
 
 ncdc_commands_t cmds[] = {
-    { L"/friend",  ncdc_cmd_friends },
-    { L"/friends", ncdc_cmd_friends },
-    { L"/login",   ncdc_cmd_login },
-    { L"/logout",  ncdc_cmd_logout },
-    { L"/msg",     ncdc_cmd_msg },
-    { L"/post",    ncdc_cmd_post },
-    { L"/quit",    ncdc_cmd_quit },
+    { L"/ack",      ncdc_cmd_ack },
+    { L"/friend",   ncdc_cmd_friends },
+    { L"/friends",  ncdc_cmd_friends },
+    { L"/login",    ncdc_cmd_login },
+    { L"/logout",   ncdc_cmd_logout },
+    { L"/markread", ncdc_cmd_ack },
+    { L"/msg",      ncdc_cmd_msg },
+    { L"/post",     ncdc_cmd_post },
+    { L"/quit",     ncdc_cmd_quit },
     { NULL, NULL }
 };
 
diff --git a/ncdc/src/mainwindow.c b/ncdc/src/mainwindow.c
index afa5f0e..cfee626 100644
--- a/ncdc/src/mainwindow.c
+++ b/ncdc/src/mainwindow.c
@@ -119,7 +119,7 @@ ncdc_mainwindow_callback(ncdc_input_t i, wchar_t const *s,
     if (s[0] == '/') {
         ret = ncdc_dispatch(mainwin, s);
     } else {
-        wchar_t *post = calloc(wcslen(s)+6, sizeof(wchar_t));
+        wchar_t *post = calloc(wcslen(s)+7, sizeof(wchar_t));
 
         wcscat(post, L"/post ");
         wcscat(post, s);
@@ -202,6 +202,8 @@ static void ncdc_mainwindow_render_status(ncdc_mainwindow_t n)
     FILE *f = open_wmemstream(&status, &statuslen);
     wchar_t const *wintitle = NULL;
     ncdc_textview_t view = NULL;
+    size_t i = 0;
+    dc_channel_t channel = NULL;
 
     werase(n->sep1);
     return_if_true(f == NULL,);
@@ -221,8 +223,18 @@ static void ncdc_mainwindow_render_status(ncdc_mainwindow_t n)
     fwprintf(f, L" [%d: %ls]", n->curview,
              (wintitle != NULL ? wintitle : L"n/a")
         );
-    fclose(f);
 
+    fwprintf(f, L" [Act:");
+    for (i = 0; i < n->views->len; i++) {
+        view = g_ptr_array_index(n->views, i);
+        channel = ncdc_textview_channel(view);
+        if (channel != NULL && dc_channel_has_new_messages(channel)) {
+            fwprintf(f, L" %d", i);
+        }
+    }
+    fwprintf(f, L"]");
+
+    fclose(f);
     mvwaddwstr(n->sep1, 0, 0, status);
     free(status);
 }
@@ -287,6 +299,7 @@ void ncdc_mainwindow_switchview(ncdc_mainwindow_t n, int idx)
 {
     return_if_true(n == NULL || n->views == NULL,);
     return_if_true(idx >= n->views->len,);
+
     n->curview = idx;
 }
 
@@ -329,16 +342,33 @@ void ncdc_mainwindow_log(ncdc_mainwindow_t w, wchar_t const *fmt, ...)
     ncdc_textview_append(w->log, buf);
 }
 
+static void ncdc_mainwindow_ack_view(ncdc_mainwindow_t n)
+{
+#if 0
+    dc_channel_t c = ncdc_mainwindow_current_channel(n);
+    return_if_true(c == NULL,);
+    return_if_true(dc_channel_messages(c) == 0,);
+
+    dc_message_t m = dc_channel_nth_message(c, dc_channel_messages(c)-1);
+    dc_api_channel_ack(dc_session_api(current_session),
+                       dc_session_me(current_session),
+                       c, m
+        );
+#endif
+}
+
 void ncdc_mainwindow_rightview(ncdc_mainwindow_t n)
 {
     return_if_true(n == NULL,);
     n->curview = (n->curview + 1) % n->views->len;
+    ncdc_mainwindow_ack_view(n);
 }
 
 void ncdc_mainwindow_leftview(ncdc_mainwindow_t n)
 {
     return_if_true(n == NULL,);
     n->curview = (n->curview - 1) % n->views->len;
+    ncdc_mainwindow_ack_view(n);
 }
 
 dc_channel_t ncdc_mainwindow_current_channel(ncdc_mainwindow_t n)
diff --git a/todo.org b/todo.org
index 014ed18..35416ba 100644
--- a/todo.org
+++ b/todo.org
@@ -1,6 +1,8 @@
-* Channels [1/4]
+* General
+** TODO move key handling away from the thread the event_loop thread
+* Channels [2/4]
 ** TODO Automatically open window for 1:1 and 1:N
-** TODO send v6/api/channels/$ID/ack for "I read that shit"
+** DONE send v6/api/channels/$ID/ack for "I read that shit"
 ** TODO add timestamps from messages
 ** DONE add message sending
 * Guilds [0/3]