diff --git a/Taumath.cpp b/Taumath.cpp
index 94e932f..1dba4ad 100644
--- a/Taumath.cpp
+++ b/Taumath.cpp
@@ -57,6 +57,7 @@ const unsigned char *Setup[]={
 	"npr(n,r)=(n!)/(n-r)!",
 	"ncr(n,r)=n!/(r!(n-r)!)",
 	"xor(x,y)=or(and(x,not(y)),and(not(x),y))",
+	"derive(f)=d(f)",
 	NULL
 };
 
@@ -66,8 +67,6 @@ int AddIn_main(int isAppli, unsigned short OptionNum)
 	unsigned char *expr;
 	char fkey = NULL;
 
-	//fkey = *(get_tex_flag_address());
-
 	initialize_tuamath();
 	// initialize failed ?
 	if (!(free_stack && mem && stack && symtab && binding && arglist && logbuf))
diff --git a/console.c b/console.c
index c432f0f..7274440 100644
--- a/console.c
+++ b/console.c
@@ -857,7 +857,7 @@ void Console_FMenu_Init()
 	// Does the file exists ?
 	// Todo : check the error codes...
 	if(!cfg) {
-		unsigned char conf_standard[] = {"F1 calc\nd(\nintegral(\ntaylor(\nsum(\nproduct(\nsimplify(\nfactor(\nF2 trig\ncosh(\narccosh(\nsinh(\narcsinh(\ntanh(\narctanh(\nF3 cplx\nmag(\narg(\nreal(\nimag(\nconj(\npolar(\nrect(\nF4 alge\nabs(\ndet(\nadj(\ncross(\ncurl(\ncontract(\nhilbert(\nF5 poly\nnroots(\ndeg(\ncoeff(\nquotient(\nhermite(\nlaguerre(\nlegendre(\nF6 arit\nmod(\ngcd(\nlcd(\nisprime(\nprime(\nfactor(\n"};
+		unsigned char conf_standard[] = {"F1 calc\nderive(\nintegral(\ntaylor(\nsum(\nproduct(\nsimplify(\nfactor(\nF2 trig\ncosh(\narccosh(\nsinh(\narcsinh(\ntanh(\narctanh(\nF3 cplx\nmag(\narg(\nreal(\nimag(\nconj(\npolar(\nrect(\nF4 alge\nabs(\ndet(\nadj(\ncross(\ncurl(\ncontract(\nhilbert(\nF5 poly\nnroots(\ndeg(\ncoeff(\nquotient(\nhermite(\nlaguerre(\nlegendre(\nF6 arit\nmod(\ngcd(\nlcd(\nisprime(\nprime(\nfactor(\n"};
 		memory_createfile("\\\\fls0\\FMENU.cfg", strlen((char*)conf_standard)+1);
 		handle = memory_openfile("\\\\fls0\\FMENU.cfg", _OPENMODE_READWRITE);
 		memory_writefile(handle, conf_standard, strlen((char*)conf_standard)+1);