diff --git a/README.md b/README.md
index 3bc98b5b4..84bf68afc 100644
--- a/README.md
+++ b/README.md
@@ -91,6 +91,11 @@ After the SDK is built, just open the Linphone Xcode project with Xcode, and pre
 
 * Video capture does not work in simulator (not implemented by simulator?).
 
+* Link errors with x86_64: this happens when you try to run linphone on the iPhone 5S/6/6+ simulators.
+  This is due to the fact that we're not building the SDK for the x86_64 architecture, due to it being redundant with i386 (and increasing dramatically the compile time and build size).
+  The solution (temporary) is to force the acceptable architectures to be 'armv7' only (remove 'arm64') and disable the "build active architecture" flag in the linphone, XMLRPC and NinePatch projects.
+  Don't forget to re-enable them when archiving your project.
+
 ## DEBUGING THE SDK
 
 Sometime it can be useful to step into liblinphone SDK functions. To allow Xcode to enable breakpoint within liblinphone, SDK must be built with debug symbols.