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diff --git a/host/docs/usrp2.dox b/host/docs/usrp2.dox
index ab36fe1a8..359772f05 100644
--- a/host/docs/usrp2.dox
+++ b/host/docs/usrp2.dox
@@ -466,5 +466,12 @@ If you need to change any of there, you should then be able to run:
to set the 'mac-addr', 'serial' and 'Mboard'.
+\subsection usrp2_known_issues Known Issues
+
+- When setting `clock_source` to external, but not providing an external
+ reference, there are cases when a successful lock is reported even though
+ no clock signal is present, which can cause false positives. Terminating the
+ clock input may help in some cases.
+
*/
// vim:ft=doxygen: