diff --git a/README.md b/README.md
index a8caf3e..1a7a8ee 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,12 @@ The tests were run on a system with the following specs
 Notes: All the algorithms were run with the maximum compression mode.
 
 ## Results
+
+All the tables have the next categories:
+ - **Time:** The time the compression process took. Lower is better.
+ - **Compession:** The compression rate after the process. Higher is better.
+ - **Time normalized compression:** The compression normalized to the time obtained ny dividing the compression by the time. Higher is better.
+
 ### Non compressible data
 
 Test with "Non compressible data" sorted by "Time"