diff --git a/doc/tex/channelvariables.tex b/doc/tex/channelvariables.tex
index ae28818d38..05067050d0 100644
--- a/doc/tex/channelvariables.tex
+++ b/doc/tex/channelvariables.tex
@@ -948,8 +948,8 @@ ${AGENTEXTEN}        * Extension for logged in agent
 \begin{verbatim}
 ${DIALEDPEERNAME}     * Dialed peer name
 ${DIALEDPEERNUMBER}   * Dialed peer number
-${DIALEDTIME}         * Time for the call (seconds)
-${ANSWEREDTIME}       * Time from dial to answer (seconds)
+${DIALEDTIME}         * Time for the call (seconds). Is only set if call was answered.
+${ANSWEREDTIME}       * Time from answer to hangup (seconds)
 ${DIALSTATUS}         * Status of the call, one of:
                         (CHANUNAVAIL | CONGESTION | BUSY | NOANSWER
                         | ANSWER | CANCEL | DONTCALL | TORTURE)