added ignore info
diff --git a/src/afl-fuzz-bitmap.c b/src/afl-fuzz-bitmap.c
index f5364c7..a0a720f 100644
--- a/src/afl-fuzz-bitmap.c
+++ b/src/afl-fuzz-bitmap.c
@@ -720,6 +720,8 @@
 #if !TARGET_OS_IPHONE
         // we dont care if system errors, but we dont want a
         // compiler warning either
+        // See
+        // https://stackoverflow.com/questions/11888594/ignoring-return-values-in-c
         (void)(system(afl->infoexec) + 1);
 #else
         WARNF("command execution unsupported");