diff --git a/src/zmc.cpp b/src/zmc.cpp
index 1a2be0602..9839a032c 100644
--- a/src/zmc.cpp
+++ b/src/zmc.cpp
@@ -248,21 +248,21 @@ int main( int argc, char *argv[] )
 			{
 				if ( monitors[i]->PreCapture() < 0 )
 				{
-                    Error( "Failed to pre-capture monitor %d", i );
+                    Error( "Failed to pre-capture monitor %d (%d/%d)", monitors[i]->Id(), i, n_monitors );
                     zm_terminate = true;
                     result = -1;
                     break;
 				}
 				if ( monitors[i]->Capture() < 0 )
 				{
-                    Error( "Failed to capture monitor %d image", i );
+                    Error( "Failed to capture image from monitor %d (%d/%d)", monitors[i]->Id(), i, n_monitors );
                     zm_terminate = true;
                     result = -1;
                     break;
 				}
 				if ( monitors[i]->PostCapture() < 0 )
 				{
-                    Error( "Failed to post-capture monitor %d", i );
+                    Error( "Failed to post-capture monitor %d (%d/%d)", monitors[i]->Id(), i, n_monitors );
                     zm_terminate = true;
                     result = -1;
                     break;