Add known issue about x86 to docs.
Change-Id: I4ee78b479868dcf5414ff1f54545bf358b4df709
diff --git a/docs/heapprofd.md b/docs/heapprofd.md
index c45e8b2..f4faa29 100644
--- a/docs/heapprofd.md
+++ b/docs/heapprofd.md
@@ -152,6 +152,10 @@
Check whether your target process is eligible to be profiled by consulting
[Target process](#Target_process) above.
+## Known Issues
+
+* Does not work on x86 platforms (including the Android cuttlefish emulator).
+
## Manual instructions
*It is not recommended to use these instructions unless you have advanced
requirements or are developing heapprofd. Proceed with caution*