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diff --git a/docs/manual/common-usage.txt b/docs/manual/common-usage.txt
index 7c7694265f..c7e4568934 100644
--- a/docs/manual/common-usage.txt
+++ b/docs/manual/common-usage.txt
@@ -88,6 +88,8 @@ to +make+ or set in the environment:
is the recommended way of setting it.
* +GRAPH_ALT+, if set and non-empty, to use an alternate color-scheme in
build-time graphs
+* +GRAPH_OUT+ to set the filetype of generated graphs, either +pdf+ (the
+ default), or +png+.
An example that uses config files located in the toplevel directory and
in your $HOME: