Message about compatibility

Author: Elsie19

headers/cmds/README.md

@@ -1,6 +1,6 @@
 ## Pure Bash coreutils
 
-These headers correspond to their coreutils command. These really should not be used unless you don't have (for whatever reason) access to said commands. Most of these headers implement some flags/options, but not all.
+These headers correspond to their coreutils command. These really should not be used unless you don't have (for whatever reason) access to said commands. Most of these headers implement some flags/options, but not all, and try to compatible with their GNU counterparts.
 
 | Command       | Missing features                             | Included features   |
 |---------------|----------------------------------------------|---------------------|