diff --git a/bspc.c b/bspc.c
index 5a75cff..d98eec7 100644
--- a/bspc.c
+++ b/bspc.c
@@ -307,10 +307,12 @@ int main(void) {
 
 	for(int i = 0; i < 64; i++) {
 		if(final[i] == '\0') {
+			/* XXX: susceptible to buffer underflow */
 			if (i) final[i - 1] = '\0';
 			break;
 		}
 		if(isdigit(final[i]) && *current == final[i])
+			/* XXX: susceptible to buffer overflow */
 			final[i + 1] = '<';
 		if(final[i] == '\n')
 			final[i] = ' ';