diff --git a/2020/endoh3/README.md b/2020/endoh3/README.md
index 3a2e857a1..7de63d7ae 100644
--- a/2020/endoh3/README.md
+++ b/2020/endoh3/README.md
@@ -4,6 +4,9 @@
 make
 ```
 
+An alternate version of this program exists. See [Alternate
+code](#alternate-code) below.
+
 
 ## To use:
 
@@ -22,23 +25,30 @@ make
 
 ## Alternate code:
 
-An alternate version of this entry, `prog.alt.c`, is provided.  This alternate code uses Unicode letters.
+An alternate version of this entry, [prog.alt.c](prog.alt.c), is provided.  This
+alternate code uses Unicode letters.
 
-To compile this alternate version:
+
+### Alternate build:
 
 ```sh
 make alt
 ```
 
+
+### Alternate use:
+
 Use `prog.alt` as you would `prog` above.
 
 
 ## Judges' remarks:
 
-You may be tempted to use a mirror. Resist the temptation! Try figuring out how the clock hands are drawn.
-Can you change the program to make it draw a familiar (non-mirrored) clock face? Can you add the second hand?
+You may be tempted to use a mirror. Resist the temptation! Try figuring out how
+the clock hands are drawn.  Can you change the program to make it draw a
+familiar (non-mirrored) clock face? Can you add the second hand?
 
-When using the `run_clock` shell script, your perception of time might depend on what time it is.
+When using the [run_clock.sh](run_clock.sh) shell script, your perception of
+time might depend on what time it is.
 
 
 ## Author's remarks:
diff --git a/thanks-for-help.md b/thanks-for-help.md
index e6b6ca487..50656538b 100644
--- a/thanks-for-help.md
+++ b/thanks-for-help.md
@@ -4337,13 +4337,14 @@ quick.
 
 Cody also reported (during the preview period of 2020) for some systems (at some
 point?) like macOS the use of `make clock` would not work due possibly to a
-timing issue so [Yusuke](#yusuke) changed it to compile the [clock.c](/2020/endoh3/clock.c)
-file directly (this might have been fixed in the Makefile later on but it
-doesn't hurt to keep it in and this way it isn't a problem in any system). How
-Cody remembers this minor detail more than three years ago is something that
-many people might wonder but he also once told us that if someone moves
-something of his even a millimetre from where it was he knows it so he might be
-called unusual (and he argues, with pride, eccentric :-) ) :-)
+timing issue so [Yusuke](#yusuke) changed it to compile the
+[clock.c](/2020/endoh3/clock.c) file directly (this might have been fixed in the
+Makefile later on but it doesn't hurt to keep it in and this way it isn't a
+problem in any system). How Cody remembers this minor detail more than three
+years ago is something that many people might wonder but he also once told us
+that if someone moves something of his even a millimetre from where it was he
+knows it so he might be called unusual (and he argues, with pride, eccentric :-)
+) :-)
 
 
 ## <a name="2020_ferguson2"></a>[2020/ferguson2](/2020/ferguson1/prog.c) ([README.md](/2020/ferguson1/README.md))