diff --git a/docs/refguide.xml b/docs/refguide.xml
index eae1c92a1..2e892430c 100644
--- a/docs/refguide.xml
+++ b/docs/refguide.xml
@@ -2604,7 +2604,11 @@ lists the relevant options and describes what they do.</para>
           ICMP, SYN, ACK, or whatever) and during the actual port
           scanning phase. Decoys are also used during remote OS
           detection (<option>-O</option>).  Decoys do not work with
-          version detection or TCP connect scan.</para>
+          version detection or TCP connect scan.  When a scan delay is
+          in effect, the delay is enforced between each batch of
+          spoofed probes, not between each individual probe. Because
+          decoys are sent as a batch all at once, they may temporarily
+          violate congestion control limits.</para>
 
           <para>It is worth noting that using too many decoys may
           slow your scan and potentially even make it less
diff --git a/scan_engine.cc b/scan_engine.cc
index 0f886afee..3903d96c3 100644
--- a/scan_engine.cc
+++ b/scan_engine.cc
@@ -2694,7 +2694,12 @@ static UltraProbe *sendArpScanProbe(UltraScanInfo *USI, HostScanStats *hss,
 }
 
 /* If this is NOT a ping probe, set pingseq to 0.  Otherwise it will be the
-   ping sequence number (they start at 1).  The probe sent is returned. */
+   ping sequence number (they start at 1).  The probe sent is returned.
+   
+   This function also handles the sending of decoys. There is no fine-grained
+   control of this; all decoys are sent at once on one call of this function.
+   This means that decoys do not honor any scan delay and may violate congestion
+   control limits. */
 static UltraProbe *sendIPScanProbe(UltraScanInfo *USI, HostScanStats *hss, 
 			    const probespec *pspec, u8 tryno, u8 pingseq) {
   u8 *packet = NULL;