diff --git a/floatimg.h b/floatimg.h
index 334ce97..19b52be 100644
--- a/floatimg.h
+++ b/floatimg.h
@@ -3,7 +3,7 @@
  *			ugly code from tTh
  */
 
-#define		FIMG_VERSION	100
+#define		FIMG_VERSION	101
 
 /*
  *	in memory descriptor
@@ -58,6 +58,7 @@ int   fimg_type_is_valid(int type);
 
 
 int   fimg_print_version(int k);
+void fimg_print_sizeof(void);
 void  fimg_printhead(FloatImg *h);
 int   fimg_describe(FloatImg *head, char *txt);
 char *fimg_str_type(int type);
diff --git a/lib/fimg-core.c b/lib/fimg-core.c
index 412ef8c..a8b606c 100644
--- a/lib/fimg-core.c
+++ b/lib/fimg-core.c
@@ -48,6 +48,12 @@ if (51 == k) {
 return 0;
 }
 /* --------------------------------------------------------------------- */
+void fimg_print_sizeof(void)
+{
+fprintf(stderr, "   sz FloatImg =   %lu\n", sizeof(FloatImg));
+fprintf(stderr, "   sz filehead =   %lu\n", sizeof(FimgFileHead));
+}
+/* --------------------------------------------------------------------- */
 void fimg_printhead(FloatImg *h)
 {
 printf("%5d  %5d  %2d  %p %p %p %p\n", h->width, h->height, h->type,
diff --git a/lib/t.c b/lib/t.c
index 9b9e4d7..8b387fa 100644
--- a/lib/t.c
+++ b/lib/t.c
@@ -266,7 +266,10 @@ while ((opt = getopt(argc, argv, "gn:v")) != -1) {
 		}
 	}
 
-if (verbosity) fimg_print_version(0);
+if (verbosity)	{
+	fimg_print_version(1);
+	fimg_print_sizeof();
+	}
 
 // foo = essai_normalize();
 // fprintf(stderr, "retour essai normalize -> %d\n", foo);