doc change @rput <-> robject (#79)

* doc change @rput <-> robject

README.md

@@ -202,6 +202,12 @@ Note that when moving models from Julia to R, you may see warnings like:
 
 This is expected because we don't allow optimization to stop naturally when moving models back forth, but instead force optimization to stop *because we already found an optimum in the other language*.
 
+## Running JellyMe4 from .Rmd / R / R-JuliaCall
+
+If you need to run JellyMe4 from R (via JuliaCall), the convenience macro`@rput` will not work. Instead you have to invoke `robject` directly: 
+```R
+julia_eval("robject(:lmerMod, (m, machines);", need_return="R")
+```
 ## Limitations and warnings
 
 This is alpha software. It has some functionality that should work well for common use cases and even a testsuite, but this testsuite depends on two different software environments (R and Julia) and can afoul of all sorts of nasty version interactions. The testuite only tests against a single version of R and the current version of lme4. In other words, even for the parts that do work for me, they may not work for you.