diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8fbc1be..fa1743d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -42,6 +42,7 @@ add_library(tox MODULE
     src/twc-utils.c
 )
 
+set(CMAKE_C_FLAGS_DEBUG "-DTWC_DEBUG")
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99 -Wall -Wextra -Wno-unused-parameter")
 
 target_link_libraries(tox toxcore)
diff --git a/src/twc-tox-callbacks.c b/src/twc-tox-callbacks.c
index ed8944a..4707bd8 100644
--- a/src/twc-tox-callbacks.c
+++ b/src/twc-tox-callbacks.c
@@ -339,6 +339,14 @@ twc_group_namelist_change_callback(Tox *tox,
             weechat_nicklist_remove_nick(chat->buffer, nick);
             weechat_hashtable_remove(chat->nicks, &peer_number);
         }
+        else
+        {
+#ifdef TWC_DEBUG
+            weechat_printf(chat->buffer, "warning: could not find nick %s (%d) for %s",
+                           name, peer_number,
+                           change_type == TOX_CHAT_CHANGE_PEER_DEL ? "deleting" : "updating");
+#endif // TWC_DEBUG
+        }
     }
 
     if (change_type == TOX_CHAT_CHANGE_PEER_ADD
@@ -354,18 +362,33 @@ twc_group_namelist_change_callback(Tox *tox,
     {
         case TOX_CHAT_CHANGE_PEER_NAME:
             if (prev_name && name)
+#ifdef TWC_DEBUG
+                weechat_printf(chat->buffer, "%s%s [%d] is now known as %s",
+                               weechat_prefix("network"), prev_name, peer_number, name);
+#else
                 weechat_printf(chat->buffer, "%s%s is now known as %s",
                                weechat_prefix("network"), prev_name, name);
+#endif // TWC_DEBUG
             break;
         case TOX_CHAT_CHANGE_PEER_ADD:
             if (name)
+#ifdef TWC_DEBUG
+                weechat_printf(chat->buffer, "%s%s [%d] just joined the group chat",
+                               weechat_prefix("join"), name, peer_number);
+#else
                 weechat_printf(chat->buffer, "%s%s just joined the group chat",
                                weechat_prefix("join"), name);
+#endif // TWC_DEBUG
             break;
         case TOX_CHAT_CHANGE_PEER_DEL:
             if (prev_name)
+#ifdef TWC_DEBUG
+                weechat_printf(chat->buffer, "%s%s [%d] just left the group chat",
+                               weechat_prefix("quit"), prev_name, peer_number);
+#else
                 weechat_printf(chat->buffer, "%s%s just left the group chat",
                                weechat_prefix("quit"), prev_name);
+#endif // TWC_DEBUG
             break;
     }