diff --git a/2018/endoh1/.gitignore b/2018/endoh1/.gitignore
index ea1749132..15117a0a3 100644
--- a/2018/endoh1/.gitignore
+++ b/2018/endoh1/.gitignore
@@ -1 +1,5 @@
+golem.gif
+invisible.gif
+output.gif
 prog
+smily.gif
diff --git a/2018/endoh1/Makefile b/2018/endoh1/Makefile
index 52c6b95ab..fb34f0aae 100644
--- a/2018/endoh1/Makefile
+++ b/2018/endoh1/Makefile
@@ -62,8 +62,8 @@ X11_INCDIR= /opt/X11/include
 
 # Common C compiler warnings to silence
 #
-#CSILENCE=
-CSILENCE= -Wno-overlength-strings
+CSILENCE=
+#CSILENCE= -Wno-implicit-int
 
 # Common C compiler warning flags
 #
@@ -101,8 +101,8 @@ CINCLUDE=
 #CINCLUDE= -include stdlib.h
 #CINCLUDE= -include stdio.h
 #CINCLUDE= -include stdlib.h -include stdio.h
-#CINCLUDE= -I ${X11_INCDIR}
-#CINCLUDE= -I ${HOMEBREW_PREFIX}/include/SDL2
+#CINCLUDE= -I ${X11_INCDIR} -I ${X11_INCDIR}/X11
+#CINCLUDE= `${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
 #
@@ -161,11 +161,12 @@ endif
 # Special flags for this entry
 ##############################
 #
-ENTRY= XXX
+ENTRY= endoh1
 PROG= prog
 #
 OBJ= ${PROG}.o
-DATA=
+CSRC= ${PROG}.o
+DATA= golem.txt smily.txt invisible.txt
 TARGET= ${PROG}
 #
 ALT_OBJ=
@@ -214,6 +215,7 @@ clean:
 
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
+	${RM} -f output.gif golem.gif smily.gif invisible.gif
 	@-if [ -e sandwich ]; then \
 	    ${RM} -f sandwich; \
 	    echo 'ate sandwich'; \
@@ -325,4 +327,3 @@ pluto: charon
 	@echo "dwarf is a type of planet"
 	@echo "therefore, $@ is a planet"
 	@echo "having lots of planets is good feature because supernovae can help ${MAKE} a lot of them"
-
diff --git a/2018/endoh1/README.md b/2018/endoh1/README.md
index dd9ff487c..721b76a90 100644
--- a/2018/endoh1/README.md
+++ b/2018/endoh1/README.md
@@ -1,22 +1,28 @@
 # Best tool to reveal holes
 
-Yusuke Endoh  
-Twitter: @mametter  
+    Yusuke Endoh  
+    Twitter: @mametter  
 
-## To build:
+# To build:
 
-        make all
+```sh
+make
+```
 
-### To run
+### To run:
 
-    ./prog < textfile > output.gif
+```sh
+./prog < textfile > output.gif
+```
 
 ### Try:
 
-    ./prog < golem.txt > golem.gif
-    ./prog < smily.txt > smily.gif
+```sh
+./prog < golem.txt > golem.gif
+./prog < smily.txt > smily.gif
+```
 
-### Selected Judges Remarks:
+## Judges' comments:
 
 To get the best experience, use a GIF viewer that can handle animated gifs.
 On OS X you can use Safari using "open -a Safari smily.gif"
@@ -31,28 +37,34 @@ Unfortunately this won't run on your PDP8, if you had one, as it needs at
 least 2MiB of memory to run in.
 
 ## Author's comments:
+
 This program generates an animated GIF from a plain text.  Run:
 
-    gcc -o prog prog.c
-    ./prog < invisible.txt > invisible.gif
+```sh
+cc -o prog prog.c
+./prog < invisible.txt > invisible.gif
+```
 
 Open invisible.gif and then wait a minute.  You will see a hidden message.
 Can you tell the difference between letters that leaves the mark and ones that does not?
 
 Other examples:
 
-    ./prog < golem.txt > golem.gif
-    ./prog < smily.txt > smily.gif
+```sh
+./prog < golem.txt > golem.gif
+./prog < smily.txt > smily.gif
+```
 
 The program itself has a hidden message.
 
-    ./prog < prog.c > prog.gif
+```sh
+./prog < prog.c > prog.gif
+```
+
+## Copyright:
 
---------------------------------------------------------------------------------
-<!--
 (c) Copyright 1984-2018, [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/
--->