diff --git a/main.cpp b/main.cpp
index f3f2310..9ac2d22 100644
--- a/main.cpp
+++ b/main.cpp
@@ -23,12 +23,12 @@ count_type min(count_type a, count_type b) { return (a <= b) ? a : b; }
 count_type max(count_type a, count_type b) { return (a >= b) ? a : b; }
 
 // Global variables
-treap file;
-position cur  = {0, 0};
-count_type file_offset = 0;
-position clp;
-treap selection;
-string last_find, last_replace;
+treap file; // file representation
+position cur  = {0, 0}; // cursor position
+count_type file_offset = 0; // terminal file offset
+position clp; // selection initial position
+treap selection; // selection
+string last_find, last_replace; // last find/replace inputs
 
 // Accessing the file
 string get_line(count_type r, bool substitute_tab = true) {