diff --git a/src/ca/comQueRecv.h b/src/ca/comQueRecv.h
index c407f1cf7..e2b43c0dd 100644
--- a/src/ca/comQueRecv.h
+++ b/src/ca/comQueRecv.h
@@ -74,6 +74,7 @@ inline epicsFloat32 comQueRecv::popFloat32 ()
 {
     epicsFloat32 tmp;
     epicsUInt8 wire[ sizeof ( tmp ) ];
+    // optimizer will unroll this loop
     for ( unsigned i = 0u; i < sizeof ( tmp ); i++ ) {
         wire[i] = this->popUInt8 ();
     }
@@ -85,6 +86,7 @@ inline epicsFloat64 comQueRecv::popFloat64 ()
 {
     epicsFloat64 tmp;
     epicsUInt8 wire[ sizeof ( tmp ) ];
+    // optimizer will unroll this loop
     for ( unsigned i = 0u; i < sizeof ( tmp ); i++ ) {
         wire[i] = this->popUInt8 ();
     }