Add comments about gas metering

platforms/app/main.c

@@ -16,7 +16,11 @@
 #include "m3_api_libc.h"
 #include "m3_api_tracer.h"
 
-// Gas metering/limit only applies to pre-instrumented modules
+/*
+ * NOTE: Gas metering/limit only applies to pre-instrumented modules.
+ * You can generate a metered version from any wasm file automatically, using
+ *   https://github.com/ewasm/wasm-metering
+ */
 #define GAS_LIMIT       2000000000000
 
 #define MAX_MODULES     16

platforms/python/examples/02-metered.py

@@ -3,6 +3,12 @@
 import wasm3
 import os, time
 
+"""
+  NOTE: Gas metering/limit only applies to pre-instrumented modules.
+  You can generate a metered version from any wasm file automatically, using
+    https://github.com/ewasm/wasm-metering
+"""
+
 scriptpath = os.path.dirname(os.path.realpath(__file__))
 wasm_fn = os.path.join(scriptpath, "./wasm/coremark-metered.wasm")