diff --git a/README.md b/README.md
index dbf17ec..f8fb04a 100644
--- a/README.md
+++ b/README.md
@@ -25,4 +25,8 @@ Git services (for own repositories):
 
 * https://gitlab.com (prefered)
 * https://github.com
-* https://bitbucket.org
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+* https://bitbucket.org
+
+Bioinformatics:
+
+* https://rosalind.info/problems/locations/
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diff --git a/ex2.md b/ex2.md
new file mode 100644
index 0000000..f063217
--- /dev/null
+++ b/ex2.md
@@ -0,0 +1,11 @@
+Goal: implement this task
+
+https://rosalind.info/problems/ksim/
+
+1. Use the class created in the previous exercise 
+
+2. Use Object Oriented Approach (classes, small methods, get, set etc.)
+
+3. Focus for now about writing any solution, it does not have to be optimized. 
+
+4. Create an account on rosalind, and check your results
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