diff --git a/include/defines.h b/include/defines.h
index 8290ec50f..53157841f 100644
--- a/include/defines.h
+++ b/include/defines.h
@@ -15,6 +15,7 @@
 #define PLAYER_CPU                  (1 << 12) // 0x1000
 #define PLAYER_HUMAN                (1 << 14) // 0x4000
 #define PLAYER_INVISIBLE_OR_BOMB    (1 <<  8) // 0x0100
+// unused?
 #define PLAYER_UNKNOWN              (1 << 10) // 0x0400
 
 // Compiles to -0x1000 in diff.py
@@ -25,6 +26,13 @@
 #define VERSUS      2
 #define BATTTLE     3
 
+/**
+ * CC stands for cubic-centimetres.
+ * It measures engine displacement composed from
+ * cylinder volume.
+ * Generally, the main determiner of horsepower output.
+ */
+
 #define CC_50       0
 #define CC_100      1
 #define CC_150      2
diff --git a/src/code_8028DF00.c b/src/code_8028DF00.c
index 2f238282a..1d6114d90 100644
--- a/src/code_8028DF00.c
+++ b/src/code_8028DF00.c
@@ -232,7 +232,7 @@ void func_8028E3A0(void) {
 
     if (D_80150120) {
 
-        if (gCourseSelection == 3) {
+        if (gCourseSelection == COURSE_BANSHEE_BOARDWALK) {
             D_80150124 = 5;
         } else {
             D_800DC544++;