diff --git a/04_AWK/stars/awk_excercises.txt b/04_AWK/stars/awk_excercises.txt
index 85d4fe6..120183a 100644
--- a/04_AWK/stars/awk_excercises.txt
+++ b/04_AWK/stars/awk_excercises.txt
@@ -1,3 +1,10 @@
 Columns description is in the beginning of the files. 
 
-Compute number of black holes formed per every timesteps (column timenr) from files inter-binevoldat and inter-binsin.dat. At the end we should see something like a histogram. 
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+Compute number of black holes formed per every timesteps (column timenr) from files inter-binevoldat and inter-binsin.dat. At the end we should see something like a histogram. 
+
+Hints:
+
+* column 17 - initial star's type, it has to be smaller than 14
+* column 37 - final star's type, it has to be 14 (internal note that we have a black hole(BH))
+
+So, BH formes if the type was not 14 in column 17, but in the same line, in the column 37 equals 14.
\ No newline at end of file