diff --git a/1993/dgibson/README.md b/1993/dgibson/README.md
index 6807efc09..53698ae3f 100644
--- a/1993/dgibson/README.md
+++ b/1993/dgibson/README.md
@@ -1,63 +1,70 @@
 # Best Abuse of the C Preprocessor:
 
-	David Gibson
-	University of Cape Town
-
-	1 Sweet Valley Road
-	Bergvliet
-	7945
-	South Africa
+David Gibson  
+University of Cape Town  
+1 Sweet Valley Road  
+Bergvliet  
+7945  
+South Africa  
 
 ## To build:
 
-        make all
+```sh
+make all
+```
 
-## To run
+## To run:
 
-	./dgibson.sh [datafile]
+```sh
+./dgibson.sh [datafile]
+```
 
 where:
-   
-
-	datafile	initial pattern (default: dgibson.data1)
+	
+`datafile` is the initial pattern (default: dgibson.data1)
 
 ## Try:
 
-
-	./dgibson.sh dgibson.data3
+```sh
+./dgibson.sh dgibson.data3
+```
 
 ## Judges' comments:
     
-We have provided the shell script `dgibson.sh` to make it easier
+We have provided the shell script [dgibson.sh](dgibson.sh) to make it easier
 to run this entry.  Run this shell script several times to
 see what happens.
 
 There are a number of data files available:
 
-	dgibson.data1
-	dgibson.data2
-	dgibson.data3
-	dgibson.data4
-	dgibson.data5
+- [dgibson.data1](dgibson.data1)
+- [dgibson.data2](dgibson.data2)
+- [dgibson.data3](dgibson.data3)
+- [dgibson.data4](dgibson.data4)
+- [dgibson.data5](dgibson.data5)
 
-For `dgibson.data5` you will need a large screen, lots of virtual
+For [dgibson.data5](dgibson.data5) you will need a large screen, lots of virtual
 memory and lots of time!
 
 Good luck trying to use a debugger on this entry!  Life is not
 always pretty.
 
-## Author's comments
+## Author's comments:
 
-This program plays the Game of Life.
+This program plays the [Game of
+Life](https://en.wikipedia.org/wiki/Conway's_Game_of_Life).
 
 Life is a cellular automaton invented by J. H. Conway, in which each of
 a rectangular grid of cells can be alive or dead, and cells with more
 than 3 or less than 2 (out of 8) live neighbours die, and empty cells
 with exactly 3 neighbours give birth.
 
-Some notes: the "STAT n" information does not have to be present in the
-initial configuration;  the initial configuration should not have live
-cells around the edges; the grid should be a perfect rectangle.
+### Some notes:
+
+- the "STAT n" information does not have to be present in the initial
+configuration
+- the initial configuration should not have live cells around the edges
+- the grid should be a perfect rectangle.
 
 Further features: the current generation number is preserved, and the
 grid automatically resizes itself as the object gets too big or too