diff --git a/2020/kurdyukov1/Makefile b/2020/kurdyukov1/Makefile
index 4e3aa1027..e90bfa067 100644
--- a/2020/kurdyukov1/Makefile
+++ b/2020/kurdyukov1/Makefile
@@ -102,7 +102,7 @@ CINCLUDE=
 #CINCLUDE= -include stdio.h
 #CINCLUDE= -include stdlib.h -include stdio.h
 #CINCLUDE= -I ${X11_INCDIR}
-#CINCLUDE= -I ${HOMEBREW_PREFIX}/include/SDL2
+#CINCLUDE= `${SDL2_CONFIG} --cflags`
 
 # Optimization
 #
@@ -126,7 +126,7 @@ CFLAGS= ${CSTD} ${CWARN} ${ARCH} ${CDEFINE} ${CINCLUDE} ${OPT}
 LIBS=
 #LIBS= -lm
 #LIBS= -L ${X11_LIBDIR} -lX11
-#LIBS= -L ${HOMEBREW_PREFIX}/lib -lSDL
+#LIBS= `${SDL2_CONFIG} --libs`
 
 # C compiler to use
 #
@@ -138,7 +138,8 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-#CSILENCE+=
+CSILENCE+= -Wno-comma -Wno-poison-system-directories -Wno-shorten-64-to-32 \
+	-Wno-sign-conversion
 #
 CWARN+= -Weverything
 #
@@ -163,7 +164,7 @@ ENTRY= kurdyukov1
 PROG= prog
 #
 OBJ= ${PROG}.o
-DATA= prog.x86.asm prog.x86_64.asm
+DATA=
 TARGET= ${PROG}
 #
 ALT_OBJ= ${PROG}.alt.o
@@ -184,14 +185,14 @@ all: data ${TARGET}
 ${PROG}: ${PROG}.c
 	${CC} ${CFLAGS} $< -o $@ ${LIBS}
 
-${PROG}.alt: ${PROG}.alt.c
-	${CC} ${CFLAGS} --include stdint.h --include stdio.h $< -o $@ ${LIBS}
-
 # alternative executable
 #
 alt: data ${ALT_TARGET}
 	@${TRUE}
 
+${PROG}.alt: ${PROG}.alt.c
+	${CC} ${CFLAGS} --include stdint.h --include stdio.h $< -o $@ ${LIBS}
+
 # data files
 #
 data: ${DATA}
diff --git a/2020/kurdyukov1/README.md b/2020/kurdyukov1/README.md
index 3773bb7ac..290e22267 100644
--- a/2020/kurdyukov1/README.md
+++ b/2020/kurdyukov1/README.md
@@ -1,24 +1,32 @@
 # Best utility
 
+```
 Ilya Kurdyukov  
 <https://github.com/ilyakurdyukov>  
 Twitter: @ilyakurdyukov  
+```
 
-## Judges' comments:
+## To build:
 
-    make all
+```sh
+make
+```
 
-### To use:
+### To run:
 
-    ./prog
+```sh
+./prog
+```
 
 ### Try:
 
-    echo IOCCC | ./prog
+```sh
+echo IOCCC | ./prog
 
-    ./prog < prog.x86.asm
+./prog < prog.x86.asm
 
-    ./prog < prog.x86_64.asm
+./prog < prog.x86_64.asm
+```
 
 ### Alternate code
 
@@ -26,7 +34,9 @@ An even smaller alternate version of this entry, prog.alt.c, is provided.  This
 
 To compile this alternate version:
 
-    make alt
+```sh
+make alt
+```
 
 Use `prog.alt` as you would `prog` above.
 
@@ -70,11 +80,10 @@ Added a macro hack to make stdin work in binary mode under Windows (tested under
 
 - `prog.x86.asm` and for x86, although the headers are smaller, but the binary code is larger due to fewer registers and lack of 64-bit multiply.
 
+## Copyright:
 
------------------------------------------------------------------------------------------------------
 (c) Copyright 1984-2020, [Leo Broukhis, Simon Cooper, Landon Curt Noll][judges] - All rights reserved
 This work is licensed under a [Creative Commons Attribution-ShareAlike 3.0 Unported License][cc].
 
 [judges]: http://www.ioccc.org/judges.html
 [cc]: http://creativecommons.org/licenses/by-sa/3.0/
------------------------------------------------------------------------------------------------------