diff --git a/README.md b/README.md
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--- /dev/null
+++ b/README.md
@@ -0,0 +1,29 @@
+
+
+## rntviewer
+This is a work-in-progress interactive visualization tool for [RNTuple](https://root.cern.ch/doc/v618/md_tree_ntuple_v7_doc_README.html).
+
+### Getting the repo
+Clone this repository with
+```
+$ git clone --recurse-submodules
+```
+
+### Dependencies
+rntviewer currently only works on Linux (PRs welcome).
+
+The dependencies are:
+ - GLFW3 (`libglfw3-dev` on debian, `glfw-devel` on fedora, `glfw` on arch)
+ - ROOT (likely bleeding edge version, compiled from sources)
+
+Other than those, rntviewer depends on Dear ImGui and GLAD (both included in the source tree).
+
+The machine must support OpenGL 4.
+
+### Building
+Building is done with `make`. Make sure to `source /path/to/root/bin/thisroot.sh` before running it.
+
+### Usage
+```
+$ ./rntviewer
+```
diff --git a/example.png b/example.png
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diff --git a/imgui.ini b/imgui.ini
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@@ -8,9 +8,13 @@ Size=1152,1414
[Window][main]
Pos=0,0
-Size=1143,1388
+Size=1211,806
[Window][Hex View]
Pos=91,62
Size=1002,939
+[Table][0x9FEC56E3,2]
+Column 0 Weight=1.6105
+Column 1 Weight=0.3895
+