diff --git a/README.md b/README.md
index d0787a0..7527e83 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,11 @@ These functions are responsible for the library's "life time".
 This function matches _string_ against all known highlighting rules and dispatches the appropriate callback depending on _mode_.
 
 ```C
+	#define HLPATH //?!
+```
+Coma separated list of directories to be searched for syntax scripts. `#undef` to disable it entirely.
+
+```C
 	typedef void (*attribute_callback_t)(const char * const string, const int length, void * const attributes);
 ```
 The type used for defining appropriate callbacks for render_string().
@@ -89,7 +94,8 @@ hl will read from stdin and write to stdout.
 
 ### Environment variables
 ```bash
-	$HLPATH	: colon separated list of directories searched for syntax script files
+	$HLPATH	: colon separated list of directories searched for syntax script files;
+	           overriddes the value of the HLPATH macro
 ```
 
 ---