diff --git a/src/tbf_dl.cpp b/src/tbf_dl.cpp
index dd5d0f2..fc53c84 100644
--- a/src/tbf_dl.cpp
+++ b/src/tbf_dl.cpp
@@ -603,7 +603,7 @@
 		/* change state */
 		TBF_SET_ASS_ON(this, GPRS_RLCMAC_FLAG_PACCH, true);
 
-		/* start timer */
+		/* Start timer, expiry in gprs_rlcmac_tbf::handle_timeout tbf_free()s the TBF */
 		T_START(this, T0, -2001, "assignment (PACCH)", true);
 	} else {
 		LOGPTBFDL(this, LOGL_DEBUG, "Send dowlink assignment on PCH, no TBF exist (IMSI=%s)\n",