diff --git a/CMakeLists.txt b/CMakeLists.txt
index 52ea958..a708946 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,3 +1,16 @@
+# Copyright (C) 2026 Joshua Vega
+#
+# This program is free software: you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free Software
+# Foundation, either version 3 of the License, or (at your option) any later
+# version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program. If not, see <https://www.gnu.org/licenses/>.
 CMAKE_MINIMUM_REQUIRED(VERSION 4.0)
 
 PROJECT(nfgen LANGUAGES C)
@@ -7,3 +20,9 @@ SET(SOURCE_FILES
 )
 
 ADD_EXECUTABLE(nfgen ${SOURCE_FILES})
+
+SET_PROPERTY(TARGET nfgen PROPERTY C_STANDARD 11)
+
+TARGET_COMPILE_OPTIONS(nfgen PRIVATE
+  $<$<C_COMPILER_ID:AppleClang,Clang,GNU>: -Wall>
+)
diff --git a/main.c b/main.c
index db3507f..2b19ec3 100644
--- a/main.c
+++ b/main.c
@@ -1,3 +1,18 @@
+/*
+ * Copyright (C) 2026 Joshua Vega
+ *
+ * This program is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
 #include <stdio.h>
 
 int main(int argc, char** argv)