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-rw-r--r--gnuradio-core/src/lib/general/gr_costas_loop_cc.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/gnuradio-core/src/lib/general/gr_costas_loop_cc.h b/gnuradio-core/src/lib/general/gr_costas_loop_cc.h
index d7d0db67b..caa158498 100644
--- a/gnuradio-core/src/lib/general/gr_costas_loop_cc.h
+++ b/gnuradio-core/src/lib/general/gr_costas_loop_cc.h
@@ -41,6 +41,9 @@ gr_make_costas_loop_cc (float alpha, float beta,
/*!
* \brief Carrier tracking PLL for QPSK
* input: complex; output: complex
+ * <br>The Costas loop can have two output streams:
+ * stream 1 is the baseband I&Q;
+ * stream 2 is the normalized frequency of the loop
*
* \p order must be 2 or 4.
*/