diff --git a/Makefile b/Makefile
index 114036f..0b91139 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,4 @@
 
-
 .PHONY: all
 all: tinycrc.a crctest
 
diff --git a/README.md b/README.md
index a4681d6..ae43b16 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
 # TinyCRC
 
-This is a library for calculating CRC32, CRC16 and CRC8.
\ No newline at end of file
+This is a library for calculating CRC32, CRC16 and CRC8. I did not write these, but
+they are collected from various places on the interweb, and as such available under
+the MIT license.
+
+The library should be portable enough to work on embedded systems.
\ No newline at end of file
diff --git a/crctest.cpp b/crctest.cpp
index c29935e..1ad66b3 100644
--- a/crctest.cpp
+++ b/crctest.cpp
@@ -10,29 +10,31 @@ void test(const uint8_t* buffer)
     uint16_t crc16 = tinycrc_crc16(buffer, strlen((char*)buffer));
     uint8_t crc8 = tinycrc_crc8(buffer, strlen((char*)buffer));
 
-    printf("%-32s | crc32 | %08x\n", (char*)buffer, crc32);
-    printf("%-32s | crc16 |     %04x\n", (char*)buffer, crc16);
-    printf("%-32s | crc8  |       %02x\n", (char*)buffer, crc8);
-
+    printf("%-32s | %08x | %04x | %02x\n", (char*)buffer, crc32, crc16, crc8);
 }
 
 int main()
 {
     uint8_t* buffer = (uint8_t*)malloc(32);
 
+    printf("%-32s | %8d | %4d | %2d\n", (char*)buffer, 32, 16, 8);
+
+    memset((char*)buffer, 0, 32);
     strcpy((char*)buffer, "Hello World\0");
     test(buffer);
 
+    memset((char*)buffer, 0, 32);
     strcpy((char*)buffer, "Hello World!\0");
     test(buffer);
 
+    memset((char*)buffer, 0, 32);
     strcpy((char*)buffer, "Hello Worlds\0");
     test(buffer);
 
+    memset((char*)buffer, 0, 32);
     strcpy((char*)buffer, "Testing\0");
     test(buffer);
 
     free(buffer);
 
-
 }
diff --git a/src/crc16.cpp b/src/crc16.cpp
index 42311d8..38ae8f0 100644
--- a/src/crc16.cpp
+++ b/src/crc16.cpp
@@ -1,7 +1,7 @@
 #include "tinycrc.h"
 
 /*
-    CRC16
+    CRC16 (from https://stackoverflow.com/questions/10564491/function-to-calculate-a-crc16-checksum)
 */
 
 uint16_t tinycrc_crc16(const uint8_t *data, uint16_t size)
@@ -19,4 +19,4 @@ uint16_t tinycrc_crc16(const uint8_t *data, uint16_t size)
         crc = (crc << 8) ^ ((unsigned short)(x << 12)) ^ ((unsigned short)(x <<5)) ^ ((unsigned short)x);
     }
     return crc & 0xFFFF;
-}
\ No newline at end of file
+}