diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 6307870a4e..3258402288 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -5115,6 +5115,53 @@
+ HOSTTOOLS
+
+ HOSTTOOLS[doc] = "A space-separated list (filter) of tools on the build host that should be allowed to be called from within build tasks."
+
+
+
+
+ A space-separated list (filter) of tools on the build host
+ that should be allowed to be called from within build tasks.
+ Using this filter helps reduce the possibility of host
+ contamination.
+ If a tool specified in the value of
+ HOSTTOOLS is not found on the
+ build host, the OpenEmbedded build system produces
+ an error and the build is not started.
+
+
+
+ For additional information, see
+ HOSTTOOLS_NONFATAL.
+
+
+
+
+ HOSTTOOLS_NONFATAL
+
+ HOSTTOOLS_NONFATAL[doc] = "A space-separated list (filter) of tools on the build host that should be allowed to be called from within build tasks."
+
+
+
+
+ A space-separated list (filter) of tools on the build host
+ that should be allowed to be called from within build tasks.
+ Using this filter helps reduce the possibility of host
+ contamination.
+ Unlike
+ HOSTTOOLS,
+ the OpenEmbedded build system does not produce and error
+ if a tool specified in the value of
+ HOSTTOOLS_NONFATAL is not found on the
+ build host.
+ Thus, you can use HOSTTOOLS_NONFATAL
+ to filter optional host tools.
+
+
+
+
HOST_VENDOR
HOST_VENDOR[doc] = "The name of the vendor. Normally same as the TARGET_VENDOR."