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-rw-r--r--tools/wdye/wdye.adoc6
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diff --git a/tools/wdye/wdye.adoc b/tools/wdye/wdye.adoc
index d901400..98e251e 100644
--- a/tools/wdye/wdye.adoc
+++ b/tools/wdye/wdye.adoc
@@ -126,6 +126,12 @@ Example
rot13:send "Hello\r"
expect(rot13:exact {"Uryyb\r"})
+Environment
+-----------
+*WDYE_LOGGING*::
+ When this environment variable is present, *wdye* produces asciicast v2
+ files for every spawned program, in the current working directory.
+
Reporting bugs
--------------
Use https://git.janouch.name/p/liberty to report bugs, request features,