add an introduction of the formulas that show range coding

based on recommendations in #258 (comment)
FFmpeg · Feb 22, 2021 · 8a551b0 · 8a551b0
1 parent e480815
commit 8a551b0
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diff --git a/ffv1.md b/ffv1.md
@@ -486,6 +486,8 @@ SVGC:rangebinaryvalues7.svg=$$j_{0}=2$$
 AART:j_(0) = 2
 Figure: The initial value for "j", the length of the bytestream encoding. {#figureInitializeLength}
 
+The following equations define how the Range coder variables evolve as it reads or writes symbols.
+
 SVGI:!---
 SVGI:![svg](rangebinaryvalues1.svg "range binary values 1")
 SVGI:!---