Use math environment for formula.

diff --git a/doc/markdown/configuration/metrics.md b/doc/markdown/configuration/metrics.md
index 501f5a84870fa20bdb66001b9751a7ee7197fbc3..8cfc5a50fa4f2244c6fdfa6e0119d92f0e72c24b 100644 (file)
--- a/doc/markdown/configuration/metrics.md
+++ b/doc/markdown/configuration/metrics.md
@@ -58,8 +58,12 @@ It is also possible to define some generic attributes for the metric:
 
 * `grow_factor` - the multiplicator applied for the subsequent symbols inserting by the follwing rule:
 
-       score = score + grow_factor * symbol_weight
-       grow_factor = grow_factor * grow_factor
+$$
+\begin{align*}
+       score = score + grow\_factor * symbol\_weight
+       grow\_factor = grow\_factor * grow\_factor
+\end{align*}
+$$
 
 by default this value is `1.0` meaning that no weight growing is defined. By increasing this value you
 increase the efficient score of messages with multiple `spam` rules matched. This value