Update functions.md

rob-luke · Aug 22, 2016 · 6f85e7b · 6f85e7b
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diff --git a/docs/src/assr/functions.md b/docs/src/assr/functions.md
@@ -5,10 +5,14 @@ A number of functions are provided for the processing of SSR data.
 
 ## Preprocessing
 
+
+#### Filtering
+
 ```@docs
 highpass_filter(::SSR)
 ```
 
+### Referencing
 
 ```@docs
 rereference(::SSR, ::AbstractString)