diff --git a/.gitignore b/.gitignore
index cf17446..d672628 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,7 +6,8 @@ rebar3
 
 # Files produced by rebar.
 /_build/
-/doc/
+/doc/*
+!/doc/overview.edoc
 /ebin
 /rebar.lock
 /rebar3.crashdump