diff --git a/include/CRCLib.h b/include/CRCLib.h
index 39530ff..f451ffb 100644
--- a/include/CRCLib.h
+++ b/include/CRCLib.h
@@ -1,3 +1,7 @@
+/*
+ * Code Implemented From: https://www.w3.org/TR/PNG/#D-CRCAppendix
+*/
+
 /* Table of CRCs of all 8-bit messages. */
 unsigned long crc_table[256];
    
diff --git a/src/compress_util.c b/src/compress_util.c
index ebf3663..9407c8a 100644
--- a/src/compress_util.c
+++ b/src/compress_util.c
@@ -6,6 +6,9 @@
 
 #define CHUNK 1024 
 
+/*
+ * Built from exmaple provided in: https://zlib.net/zlib_how.html
+*/
 void zlib_decompress_data(unsigned char *data_chunk, size_t file_length, unsigned char **buff, size_t *sz) {
         int ret;
         unsigned int have;
@@ -68,6 +71,9 @@ void zlib_decompress_data(unsigned char *data_chunk, size_t file_length, unsigne
         fclose(of);
 }
 
+/*
+ * Built from exmaple provided in: https://zlib.net/zlib_how.html
+*/
 void zlib_compress_data(unsigned char *data_chunk, size_t file_length, unsigned char **buff, size_t *sz) {
         int ret, flush;
         unsigned int have;