--- a/tools/gfxconv.c	Tue Aug 22 15:01:23 2017 +0300
+++ b/tools/gfxconv.c	Tue Aug 22 16:54:41 2017 +0300
@@ -46,11 +46,11 @@
 
 typedef struct
 {
-    char *name;
-    char *fext;
-    BOOL in, out;
-    int format;
-    int subformat;
+    char *name;       // Descriptive name of the format
+    char *fext;       // File extension
+    BOOL in, out;     // Can read/write?
+    int format;       // Format identifier
+    int subformat;    // Subformat identifier
 } DMConvFormat;