diff --git a/kilo.c b/kilo.c
index 96df245..c4c16c8 100644
--- a/kilo.c
+++ b/kilo.c
@@ -537,7 +537,17 @@ void editorDrawRows(struct abuf *ab) {
       int len = E.row[filerow].rsize - E.coloff;
       if (len < 0) len = 0;
       if (len > E.screencols) len = E.screencols;
-      abAppend(ab, &E.row[filerow].render[E.coloff], len);
+      char *c = &E.row[filerow].render[E.coloff];
+      int j;
+      for (j=0; j<len; j++) {
+        if (isdigit(c[j])) {
+          abAppend(ab, "\x1b[31m", 5);
+          abAppend(ab, &c[j], 1);
+          abAppend(ab, "\x1b[39m", 5);
+        } else {
+          abAppend(ab, &c[j], 1);
+        }
+      }
     }
 
     abAppend(ab, "\x1b[K", 3); // Erase one line