diff --git a/harness.jai b/harness.jai
index 9aa2b80..e20e276 100644
--- a/harness.jai
+++ b/harness.jai
@@ -1,3 +1,5 @@
+// See License Information at the bottom of this file
+
 #import "Basic";
 #import "String";
 
@@ -291,4 +293,27 @@ print_error :: (msg: string, loc: Source_Code_Location)
   print("%", h.colors.red);
   print("%:% - %\n", loc.fully_pathed_filename, loc.line_number, msg);
   print("%", h.colors.normal);
-}
\ No newline at end of file
+}
+
+/*
+zlib License
+
+(C) Copyright 2023 Peter Slattery
+
+This software is provided 'as-is', without any express or implied
+warranty.  In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+  claim that you wrote the original software. If you use this software
+  in a product, an acknowledgment in the product documentation would be
+  appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+  misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+
+*/
\ No newline at end of file
diff --git a/module.jai b/module.jai
index f095793..6990788 100644
--- a/module.jai
+++ b/module.jai
@@ -1,3 +1,5 @@
+// See License Information at the bottom of this file
+
 #import "Basic";
 #import "Compiler";
 #import "File";
@@ -240,4 +242,27 @@ build_test_file :: (path_string: string, category: Test_Category) -> string
   output_path.trailing_slash = false;
 
   return path_to_string(output_path);
-}
\ No newline at end of file
+}
+
+/*
+zlib License
+
+(C) Copyright 2023 Peter Slattery
+
+This software is provided 'as-is', without any express or implied
+warranty.  In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+  claim that you wrote the original software. If you use this software
+  in a product, an acknowledgment in the product documentation would be
+  appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+  misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+
+*/
\ No newline at end of file