diff --git a/sheets/04_mip/README.md b/sheets/04_mip/README.md
index 1ba97649c27528ea09f9b325d98a95129ffb2ee2..3227bce49d128357def3672ea51a98378b6f659c 100644
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@@ -19,6 +19,7 @@ In the [previous sheet](../03_card_sat), we already used iterative model buildin
 Linear expressions are algebraic formulas of the first degree, i.e., variables are not multiplied or divided by each other (or themselves).
 As comparisons, only $\leq, =, \geq$ are allowed, but not true inequalities, making them essentially half-planes or spaces in a high-dimensional spaces (and the solution space linear).
 An example for a linear constraint is $4\cdot x_1-3 \cdot x_2+0.5\cdot x_3 \geq 7.3$.
+
 $x_1^2 \leq 3$ would *not* be linear as $x_1$ is multiplied by itself.
 Advanced functions such as $\sin x$ are of course completely forbidden (though, there are tricks to approximate them).