diff --git a/markdown/3-Solving-Problems-By-Searching/exercises/ex_1/question.md b/markdown/3-Solving-Problems-By-Searching/exercises/ex_1/question.md
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--- a/markdown/3-Solving-Problems-By-Searching/exercises/ex_1/question.md
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@@ -1,3 +1,3 @@
-
+In the problem formulation the agent devises a description of the states and actions necessary to reach the goal. For this reason the problem formulation must follow goal formulation.
 
 Explain why problem formulation must follow goal formulation.