diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0d20b64
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.pyc
diff --git a/__pycache__/errors.cpython-37.pyc b/__pycache__/errors.cpython-37.pyc
deleted file mode 100644
index ec7c6d2..0000000
Binary files a/__pycache__/errors.cpython-37.pyc and /dev/null differ
diff --git a/__pycache__/intern.cpython-37.pyc b/__pycache__/intern.cpython-37.pyc
deleted file mode 100644
index eec237f..0000000
Binary files a/__pycache__/intern.cpython-37.pyc and /dev/null differ
diff --git a/__pycache__/rstrings.cpython-37.pyc b/__pycache__/rstrings.cpython-37.pyc
deleted file mode 100644
index b04ae20..0000000
Binary files a/__pycache__/rstrings.cpython-37.pyc and /dev/null differ
diff --git a/__pycache__/rtypes.cpython-37.pyc b/__pycache__/rtypes.cpython-37.pyc
deleted file mode 100644
index 570dfdc..0000000
Binary files a/__pycache__/rtypes.cpython-37.pyc and /dev/null differ
diff --git a/cli.py b/cli.py
index ba05b9a..2165829 100755
--- a/cli.py
+++ b/cli.py
@@ -1,4 +1,20 @@
 #! /usr/bin/env python3
+"""
+This file is part of pilang.
+
+pilang 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.
+
+pilang 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 pilang.  If not, see <https://www.gnu.org/licenses/>.
+"""
 import sys
 from intern import main_class
 
diff --git a/errors.py b/errors.py
index bef5d08..20086c1 100644
--- a/errors.py
+++ b/errors.py
@@ -1,3 +1,20 @@
+"""
+This file is part of pilang.
+
+pilang 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.
+
+pilang 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 pilang.  If not, see <https://www.gnu.org/licenses/>.
+"""
+
 class nochsuchcmd:      pass
 class badarguments:     pass
 class nosuchmodule:     pass
diff --git a/intern.py b/intern.py
index df74cb6..d240b17 100644
--- a/intern.py
+++ b/intern.py
@@ -1,3 +1,19 @@
+"""
+This file is part of pilang.
+
+pilang 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.
+
+pilang 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 pilang.  If not, see <https://www.gnu.org/licenses/>.
+"""
 import sys, os
 from types import ModuleType
 import errors
diff --git a/modules/__pycache__/builtin.cpython-37.pyc b/modules/__pycache__/builtin.cpython-37.pyc
deleted file mode 100644
index 6ea14af..0000000
Binary files a/modules/__pycache__/builtin.cpython-37.pyc and /dev/null differ
diff --git a/modules/builtin.py b/modules/builtin.py
index 76ab4ad..dedaa89 100644
--- a/modules/builtin.py
+++ b/modules/builtin.py
@@ -1,3 +1,19 @@
+"""
+This file is part of pilang.
+
+pilang 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.
+
+pilang 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 pilang.  If not, see <https://www.gnu.org/licenses/>.
+"""
 import sys
 import errors
 import rtypes
diff --git a/modules/math.py b/modules/math.py
index 186a033..c8bfe85 100644
--- a/modules/math.py
+++ b/modules/math.py
@@ -1,3 +1,19 @@
+"""
+This file is part of pilang.
+
+pilang 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.
+
+pilang 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 pilang.  If not, see <https://www.gnu.org/licenses/>.
+"""
 import errors
 import rtypes
 
diff --git a/rstrings.py b/rstrings.py
index 2ffdcca..ea4ad8b 100644
--- a/rstrings.py
+++ b/rstrings.py
@@ -1,3 +1,19 @@
+"""
+This file is part of pilang.
+
+pilang 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.
+
+pilang 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 pilang.  If not, see <https://www.gnu.org/licenses/>.
+"""
 rstrings = {
     "success": "Success",
     "fail": "Failed",
diff --git a/rtypes.py b/rtypes.py
index 63de9a2..a5267c2 100644
--- a/rtypes.py
+++ b/rtypes.py
@@ -1,2 +1,18 @@
+"""
+This file is part of pilang.
+
+pilang 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.
+
+pilang 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 pilang.  If not, see <https://www.gnu.org/licenses/>.
+"""
 class success: pass
 class fail:    pass
diff --git a/test.pil b/test.pil
index c256a5a..9a11160 100644
--- a/test.pil
+++ b/test.pil
@@ -1,3 +1,18 @@
+#This file is part of pilang.
+#
+#pilang 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.
+#
+#pilang 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 pilang.  If not, see <https://www.gnu.org/licenses/>.
+
 # Enable error catching
 catch True
 # Initialise stuff