diff --git a/src/INSTALL b/src/INSTALL
index a562e206..3127425c 100644
--- a/src/INSTALL
+++ b/src/INSTALL
@@ -790,6 +790,11 @@ More documentation can be found in the doc/ directory or at http://www.recoll.or
    user preferences, all mimeview entries will be ignored except the one
    labelled application/x-all (which is set to use xdg-open by default).
 
+   The nouncompforviewmts entry, (placed at the top level, outside of the
+   [view] section), holds a list of mime types that should not be
+   uncompressed before starting the viewer (if they are found compressed, ie:
+   mydoc.doc.gz).
+
 7.4.6. Examples of configuration adjustments
 
   7.4.6.1. Adding an external viewer for an non-indexed type
diff --git a/src/README b/src/README
index fe2bd49b..c3bbc7c4 100644
--- a/src/README
+++ b/src/README
@@ -2767,6 +2767,11 @@ More documentation can be found in the doc/ directory or at http://www.recoll.or
    user preferences, all mimeview entries will be ignored except the one
    labelled application/x-all (which is set to use xdg-open by default).
 
+   The nouncompforviewmts entry, (placed at the top level, outside of the
+   [view] section), holds a list of mime types that should not be
+   uncompressed before starting the viewer (if they are found compressed, ie:
+   mydoc.doc.gz).
+
      ----------------------------------------------------------------------
 
   7.4.6. Examples of configuration adjustments