diff --git a/DESCRIPTION b/DESCRIPTION
index 769b202..5acb496 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,9 +1,12 @@
 Package: marshal
-Version: 0.0.1-9003
+Version: 0.0.1-9004
 Title: Framework to Marshal Objects to be Used in Another R Process
 Depends:
     R (>= 3.2.0)
 Suggests:
+    knitr,
+      DT,
+      jsonlite,
     bundle,
     caret,
     data.table,
@@ -32,6 +35,8 @@ Suggests:
     xgboost,
     XML,
     xml2
+VignetteBuilder:
+    knitr
 Authors@R: 
     person(given = "Henrik", family = "Bengtsson",
            role = c("aut", "cre", "cph"),
@@ -44,4 +49,4 @@ ByteCompile: TRUE
 URL: https://marshal.futureverse.org, https://github.com/HenrikBengtsson/marshal
 BugReports: https://github.com/HenrikBengtsson/marshal/issues
 Roxygen: list(markdown = TRUE)
-RoxygenNote: 7.2.3
+RoxygenNote: 7.3.1
diff --git a/inst/known_cases.json b/inst/known_cases.json
new file mode 100644
index 0000000..efa5292
--- /dev/null
+++ b/inst/known_cases.json
@@ -0,0 +1,175 @@
+[
+  {
+    "package": "base",
+    "type": "connection",
+    "if_not_marshalled": "error, incorrect result, file corruption",
+    "can_be_marshalled": false,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "parallel",
+    "type": "SOCKnode, SOCK0node",
+    "if_not_marshalled": "error",
+    "can_be_marshalled": false,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "arrow",
+    "type": "Array, Table",
+    "if_not_marshalled": "error",
+    "can_be_marshalled": true,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "caret",
+    "type": "train",
+    "if_not_marshalled": "",
+    "can_be_marshalled": true,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "cpp11",
+    "type": "function",
+    "if_not_marshalled": "error",
+    "can_be_marshalled": false,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "data.table",
+    "type": "data.table",
+    "if_not_marshalled": "",
+    "can_be_marshalled": true,
+    "must_be_marshalled": false
+  },
+  {
+    "package": "DBI",
+    "type": "DBIConnection",
+    "if_not_marshalled": "error",
+    "can_be_marshalled": false,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "inline",
+    "type": "CFunc, et al.",
+    "if_not_marshalled": "error",
+    "can_be_marshalled": false,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "keras",
+    "type": "keras.engine.training.Model",
+    "if_not_marshalled": "error",
+    "can_be_marshalled": true,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "magick",
+    "type": "magick-image",
+    "if_not_marshalled": "error",
+    "can_be_marshalled": false,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "ncdf4",
+    "type": "ncdf4",
+    "if_not_marshalled": "",
+    "can_be_marshalled": false,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "parsnip",
+    "if_not_marshalled": "",
+    "can_be_marshalled": true,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "raster",
+    "type": "RasterLayer",
+    "if_not_marshalled": "???",
+    "can_be_marshalled": false
+  },
+  {
+    "package": "Rcpp",
+    "type": "function",
+    "if_not_marshalled": "error",
+    "can_be_marshalled": false,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "reticulate",
+    "type": "python.builtin.object",
+    "if_not_marshalled": "error",
+    "can_be_marshalled": false,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "rJava",
+    "type": "jclassName, jobjRef",
+    "if_not_marshalled": "error",
+    "can_be_marshalled": false,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "rstan",
+    "type": "stanfit",
+    "if_not_marshalled": "",
+    "can_be_marshalled": true,
+    "must_be_marshalled": false
+  },
+  {
+    "package": "sparklyr",
+    "type": "tbl_spark",
+    "if_not_marshalled": "error",
+    "can_be_marshalled": false,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "terra",
+    "type": "SpatVectortype, SpatRaster",
+    "if_not_marshalled": "error",
+    "can_be_marshalled": true,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "udpipe",
+    "type": "udpipe_model",
+    "if_not_marshalled": "error",
+    "can_be_marshalled": false,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "xgboost",
+    "type": "xgb.DMatrix",
+    "if_not_marshalled": "incorrect result",
+    "can_be_marshalled": false,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "XML",
+    "type": "XMLInternalDocument, XMLInternalNode",
+    "if_not_marshalled": "segmentation fault",
+    "can_be_marshalled": true,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "xml2",
+    "type": "xml_document, xml_nodesettype, xml_node",
+    "if_not_marshalled": "error",
+    "can_be_marshalled": true,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "ShortRead",
+    "type": "FastqStreamer",
+    "if_not_marshalled": "error",
+    "can_be_marshalled": false,
+    "must_be_marshalled": true
+  },
+  {
+    "package": "polars",
+    "type": "RPolarsDataFrame, et al.",
+    "if_not_marshalled": "error",
+    "can_be_marshalled": false,
+    "must_be_marshalled": true
+  }
+]
diff --git a/man/marshal-package.Rd b/man/marshal-package.Rd
index 300719e..9318294 100644
--- a/man/marshal-package.Rd
+++ b/man/marshal-package.Rd
@@ -7,3 +7,16 @@
 \description{
 Some types of R objects can be used only in the R session they were created.  If used as-is in another R process, such objects often result in an immediate error or in obscure and hard-to-troubleshoot outcomes.  Because of this, they cannot be saved to file and re-used at a later time.  They can also not be exported to a worker in parallel processing.  These objects are sometimes referred to as non-exportable or non-serializable objects.  One solution to this problem is to use "marshalling" to encode the R object into an exportable representation that then can be used to re-create a copy of that object in another R process.  This package provides a framework for marshalling and unmarshalling R objects such that they can be transferred using functions such as \code{serialize()} and \code{unserialize()} of base R.
 }
+\seealso{
+Useful links:
+\itemize{
+  \item \url{https://marshal.futureverse.org}
+  \item \url{https://github.com/HenrikBengtsson/marshal}
+  \item Report bugs at \url{https://github.com/HenrikBengtsson/marshal/issues}
+}
+
+}
+\author{
+\strong{Maintainer}: Henrik Bengtsson \email{henrikb@braju.com} [copyright holder]
+
+}
diff --git a/vignettes/known_cases.Rmd b/vignettes/known_cases.Rmd
new file mode 100644
index 0000000..a697fe4
--- /dev/null
+++ b/vignettes/known_cases.Rmd
@@ -0,0 +1,24 @@
+---
+title: "Known Cases where Marshalling is Needed and not"
+output: rmarkdown::html_vignette
+vignette: >
+  %\VignetteEngine{knitr::rmarkdown}
+  %\VignetteIndexEntry{Known Cases where Marshalling is Needed and not}
+  %\VignetteEncoding{UTF-8}
+---
+
+
+```{r, echo = FALSE}
+known_cases <- system.file("known_cases.json", package = "marshal")
+support <- jsonlite::read_json(known_cases, simplifyVector = TRUE)
+support <- lapply(support, FUN = function(x) {
+  if (is.logical(x)) c("no", "yes")[x+1] else x
+})
+support <- as.data.frame(support)
+names <- colnames(support)
+names <- gsub("_marshalled", "_marshalled?", names)
+names <- gsub("_", " ", names)
+names <- gsub("_", " ", names)
+colnames(support) <- names
+DT::datatable(support, options = list(pageLength = 50))
+```