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-rw-r--r--libavcodec/celp_filters.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/libavcodec/celp_filters.h b/libavcodec/celp_filters.h
index d9db95d454..6069a3fcff 100644
--- a/libavcodec/celp_filters.h
+++ b/libavcodec/celp_filters.h
@@ -90,7 +90,8 @@ int ff_celp_lp_synthesis_filter(int16_t *out,
* @param filter_coeffs filter coefficients.
* @param in input signal
* @param buffer_length amount of data to process
- * @param filter_length filter length (10 for 10th order LP filter)
+ * @param filter_length filter length (10 for 10th order LP filter). Must be
+ * greater than 4 and even.
*
* @note Output buffer must contain filter_length samples of past
* speech data before pointer.