diff --git a/src/graphics/graphics.c b/src/graphics/graphics.c
index ed0584a..b327f5d 100644
--- a/src/graphics/graphics.c
+++ b/src/graphics/graphics.c
@@ -603,10 +603,11 @@ static void show_user_action(GLuint *arrows, int arrows_nb, int address, int req
 
     if (address >=  0 && current_weight == requested_weight){
         printf("arrow (%d,%d,%d,%d) found at address %d;\n\
-                                                  current_weight == requested_weight  =>  END",\
+                                                  requested_weight == current_weight  =>  END",\
         arrows[address + 1], arrows[address + 2], arrows[address + 3], arrows[address + 4], address/5); return;}
 
-    if (address == -1 && requested_weight == 0) {printf("no such arrow found (%d,%d,%d,%d) && requested weight == 0  =>  END",\
+    if (address == -1 && requested_weight == 0) {printf("no such arrow found (%d,%d,%d,%d)\n\
+                                                  requested weight == 0  =>  END",\
         arrows[address + 1], arrows[address + 2], arrows[address + 3], arrows[address + 4]); return;}
 }
 
@@ -624,12 +625,15 @@ static void show_buffers_states(int space_X, int space_Y, int space_Z, int arrow
     printf("\n   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -   -");
     printf("\n    buffer_vertex_offset_after grids = %6d\t%6d  = (x+1)*(y+1)*(z+1);  <-->  (x,y,z = %d,%d,%d)",\
            offset_after_grids,  (space_X + 1)*(space_Y + 1)*(space_Z + 1), space_X, space_Y, space_Z);
+
     printf("\n   buffer_vertex_offset_after arrows = %6d\t%6d  = %d + %d;  <-->  %d = 12 x %d  (there are %d cubes)",\
            offset_after_arrows, offset_after_arrows, offset_after_grids,\
                   difference, difference, difference / 12, difference / 12);
+
     printf("\n     buffer_lines_offset after cubes = %6d\t%6d  = 2 * (%dx%d + %dx%d + %dx%d);  <-->  2 * (x*y + x*z + y*z)",\
            buffer_lines_size_after_cubes, ((space_X+1) * (space_Y+1) + (space_X+1) * (space_Z+1) + (space_Y+1) * (space_Z+1)) * 2,
            space_X+1, space_Y+1, space_X+1, space_Z+1, space_Y+1, space_Z+1);
+
     printf("\n    buffer_lines_offset after arrows = %6d\t%6d  = %d + %d;  <-->  %d = (3 + 4) x 2 x %d  (arrows_nb = %d)\n",\
            buffer_lines_size, buffer_lines_size, buffer_lines_size_after_cubes,\
            buffer_lines_size - buffer_lines_size_after_cubes, arrows_nb * 14, arrows_nb, arrows_nb);
@@ -815,7 +819,7 @@ void main_test_graphics (void)
     }
 
     show_buffers_states(space_X, space_Y, space_Z, arrows_nb,
-                                offset_after_grids, buffer_vertex_size,
-                                buffer_lines_size_after_cubes, buffer_lines_size);
+                        offset_after_grids, buffer_vertex_size,
+                        buffer_lines_size_after_cubes, buffer_lines_size);
 }