diff --git a/2001/ctk/README.md b/2001/ctk/README.md
index 23bcc7736..9762d3d59 100644
--- a/2001/ctk/README.md
+++ b/2001/ctk/README.md
@@ -17,12 +17,24 @@ make
 ./ctk
 ```
 
+[Yusuke Endoh](/winners.html#Yusuke_Endoh) provided a patch to fix the ANSI
+escape codes. It became apparent to [Cody Boone
+Ferguson](/winners.html#Cody_Boone_Ferguson) (when he was looking at the source
+code of this entry) that it was no longer valid ANSI escape sequences. He has
+used them before but that was a long time ago and with Yusuke's patch it works.
+Cody notes that this fix will not just for linux but macOS too. Thank you Yusuke
+for your assistance!
+
+
 ### Try:
 
 ```sh
 echo "Do or do not. There is no try."
 ```
 
+Make sure to hit 'q' to exit or else your terminal will be messed up (to restore
+it you can try `stty sane` or `reset`).
+
 ## Judges' comments:
 
 No matter how careful you are, this guy eventually crashes.  Most people
diff --git a/2001/ctk/ctk.c b/2001/ctk/ctk.c
index b371fbee0..6aba6497c 100644
--- a/2001/ctk/ctk.c
+++ b/2001/ctk/ctk.c
@@ -10,7 +10,7 @@ char x[]="((((((((((((((((((((((",w[]=
 "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b";char r[]={92,124,47},l[]={2,3,1
 ,0};char*T[]={"  |","  |","%\\|/%"," %%%",""};char d=1,p=40,o=40,k=0,*a,y,z,g=
 -1,G,X,**P=&T[4],f=0;unsigned int s=0;void u(int i){int n;printf(
-"\233;%uH\233L%c\233;%uH%c\233;%uH%s\23322;%uH@\23323;%uH \n",*x-*w,r[d],*x+*w
+"\x1b[H\x1b[L\x1b[;%uH%c\x1b[;%uH%c\x1b[;%uH%s\x1b[22;%uH@\x1b[23;%uH \n",*x-*w,r[d],*x+*w
 ,r[d],X,*P,p+=k,o);if(abs(p-x[21])>=w[21])exit(0);if(g!=G){struct itimerval t=
 {0,0,0,0};g+=((g<G)<<1)-1;t.it_interval.tv_usec=t.it_value.tv_usec=72000/((g>>
 3)+1);setitimer(0,&t,0);f&&printf("\e[10;%u]",g+24);}f&&putchar(7);s+=(9-w[21]