diff --git a/src/mrtools.h b/src/mrtools.h
index a47cc0fb..1f09bb7e 100644
--- a/src/mrtools.h
+++ b/src/mrtools.h
@@ -33,7 +33,7 @@ extern "C" {
 
 /*** library-private **********************************************************/
 
-/* match tools */
+/* math tools */
 int     mr_exactly_one_bit_set     (int v);
 
 /* string tools */
@@ -115,6 +115,7 @@ void     mr_split_filename          (const char* pathNfilename, char** ret_basen
 int      mr_get_filemeta            (const void* buf, size_t buf_bytes, uint32_t* ret_width, uint32_t *ret_height);
 char*    mr_get_fine_pathNfilename  (const char* folder, const char* desired_name);
 
+
 /* macros */
 #define MR_QUOTEHELPER(name) #name
 #define MR_STRINGIFY(macro) MR_QUOTEHELPER(macro)