diff --git a/src/ship.c b/src/ship.c
index 337bc5b..913ed4a 100644
--- a/src/ship.c
+++ b/src/ship.c
@@ -58,15 +58,16 @@ char** ship_getTech(int* n, const int* tech, const int techmax) {
   char** shipnames;
   Ship** ships;
   
+  /* Get availabble ships for tech. */
   ships = malloc(sizeof(Ship*) * ship_nstack);
   num = 0;
   for(i = 0; i < ship_nstack; i++) {
-    if(ship_stack[i].tech <= tech[0]) {
+    if(ship_stack[i].tech <= tech[0]) { /* Check vs base tech. */
       ships[num] = &ship_stack[i];
       num++;
     } else {
       for(j = 0; j < techmax; j++)
-        if(tech[j] == ship_stack[i].tech) {
+        if(tech[j] == ship_stack[i].tech) { /* Check vs special tech. */
           ships[num] = &ship_stack[i];
           num++;
         }