diff --git a/docs/src/index.md b/docs/src/index.md
index b725c06..5448da5 100644
--- a/docs/src/index.md
+++ b/docs/src/index.md
@@ -6,11 +6,24 @@ CurrentModule = GeoEnergyIO
 
 Documentation for [GeoEnergyIO](https://github.com/sintefmath/GeoEnergyIO.jl).
 
+## Parsing of simulation cases
+
 ```@docs
 parse_data_file
+```
+
+## Parsing and processing of corner-point grids
+
+```@docs
 parse_grdecl_file
 mesh_from_grid_section
+```
+
+## Utilities
+
+```@docs
 get_data_file_cell_region
+number_of_tables
 ```
 
 ```@index
diff --git a/src/GeoEnergyIO.jl b/src/GeoEnergyIO.jl
index 032b01d..1aced82 100644
--- a/src/GeoEnergyIO.jl
+++ b/src/GeoEnergyIO.jl
@@ -3,9 +3,10 @@ module GeoEnergyIO
     export parse_grdecl_file
     export mesh_from_grid_section
     export get_data_file_cell_region
+    export number_of_tables
 
     include("InputParser/InputParser.jl")
-    import .InputParser: parse_data_file, parse_grdecl_file, get_data_file_cell_region
+    import .InputParser: parse_data_file, parse_grdecl_file, get_data_file_cell_region, number_of_tables
 
     include("CornerPointGrid/CornerPointGrid.jl")
     import .CornerPointGrid: mesh_from_grid_section
diff --git a/src/InputParser/utils.jl b/src/InputParser/utils.jl
index 39895fc..56c6dab 100644
--- a/src/InputParser/utils.jl
+++ b/src/InputParser/utils.jl
@@ -484,6 +484,11 @@ function next_keyword!(f)
     return m
 end
 
+"""
+    number_of_tables(outer_data, t::Symbol)
+
+Number of tables for given type `t`: one of `:satnum`, `:pvtnum` or `:eqlnum`.
+"""
 function number_of_tables(outer_data, t::Symbol)
     rs = outer_data["RUNSPEC"]
     if haskey(rs, "TABDIMS")