diff --git a/2015/schweikhardt/Makefile b/2015/schweikhardt/Makefile
index 49477cc25..442ccd7f1 100644
--- a/2015/schweikhardt/Makefile
+++ b/2015/schweikhardt/Makefile
@@ -129,7 +129,7 @@ all: data ${TARGET}
 	sandwich supernova deep_magic magic charon pluto
 
 ${PROG}: ${PROG}.c
-	${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
+	${CC} ${CFLAGS} -UEOF -DEOF=-1 $< -o $@ ${LDFLAGS}
 
 # alternative executable
 #
diff --git a/2015/schweikhardt/README.md b/2015/schweikhardt/README.md
index 4ce27958c..779221c65 100644
--- a/2015/schweikhardt/README.md
+++ b/2015/schweikhardt/README.md
@@ -24,6 +24,9 @@ For more detailed information see [2015 schweikhardt in bugs.md](/bugs.md#2015-s
 
 where n is a base 16 number of any size.
 
+NOTE: although it's supposed to be a base 16 number nothing will stop you from
+doing something else. The author explains this in more details.
+
 
 ### Try:
 
@@ -31,6 +34,10 @@ where n is a base 16 number of any size.
 ./try.sh
 ```
 
+After running it once to see what commands are run, you might wish to run it a
+second time and just hold down space to see a fun scroll of numbers especially
+where zeroes move to the right.
+
 
 ## Judges' remarks:
 
@@ -445,7 +452,7 @@ In a certain way, the program is character set and encoding agnostic.
 
 * The `EOF` macro from `<stdio.h>` must expand to `-1` since it is used
 to decrement a pointer and do some other math.
-None of the tools catches this one. The program self-protects against unusual
+None of the tools catch this one. The program self-protects against unusual
 systems with `#if EOF + __STDC__` followed by `#error goofy!`. In the rare event
 your system is goofy, replace all `EOF` tokens with `(-1)` and remove the
 `#error` directive.
diff --git a/thanks-for-help.md b/thanks-for-help.md
index b5dd9b260..40602784f 100644
--- a/thanks-for-help.md
+++ b/thanks-for-help.md
@@ -3919,7 +3919,12 @@ past).
 
 ## <a name="2015_schweikhardt"></a>[2015/endoh3](/2015/schweikhardt/prog.c) ([README.md](/2015/schweikhardt/README.md]))
 
-[Cody](#cody) added the [try.sh](2015/schweikhardt/try.sh) script.
+[Cody](#cody) fixed the build so that `EOF` will be `-1` as the program assumes
+this. It was decided by Cody to do `-UEOF -DEOF=-1` so as to not have to modify
+the code any with C preprocessor directives (the preferred way) or changing
+`EOF` to `-1`.
+
+Cody also added the [try.sh](2015/schweikhardt/try.sh) script.
 
 
 ## <a name="2015_yang"></a>[2015/yang](/2015/yang/prog.c) ([README.md](/2015/yang/README.md]))