Minor change

diegotrap · Jan 17, 2014 · 84f4dfb · 84f4dfb
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diff --git a/filters.mdown b/filters.mdown
@@ -72,4 +72,6 @@ From [Butterworth filter, Wikipedia](http:https://en.wikipedia.org/wiki/Butterworth_fi
 
 * two frequencies which ratio is 1:10 are separate by a decade
 * two frequencies which ratio is 1:2 are separate by a octave
-* 1 decade is 3.33 octaves
+* 1 decade is 3.33 octaves
+
+$$\frac{6dB}{oct} = \frac{20dB}{dec}$$
diff --git a/filters.pdf b/filters.pdf