diff --git a/doc/Dependencies.md b/doc/Dependencies.md
index b4b0c348c..3f6335cb7 100644
--- a/doc/Dependencies.md
+++ b/doc/Dependencies.md
@@ -1,6 +1,6 @@
 # Dependency report for PrusaSlicer
 ## Possible dynamic linking on Linux
-* zlib: This should not be even mentioned in our cmake scripts but due to a bug in the system libraries of gtk it has to be linked to PrusaSlicer.
+* zlib: Strict dependency required from the system, linked dynamically. Many other libs depend on zlib.
 * wxWidgets: searches for wx-3.1 by default, but with cmake option `SLIC3R_WX_STABLE=ON` it will use wx-3.0 bundled with most distros.
 * libcurl
 * tbb
@@ -10,13 +10,13 @@
 * expat
 * openssl
 * nlopt
-* gtest
+* openvdb: This library depends on other libs, namely boost, zlib, openexr, blosc (not strictly), etc... 
 
 ## External libraries in source tree
 * ad-mesh: Lots of customization, have to be bundled in the source tree.
 * avrdude: Like ad-mesh, many customization, need to be in the source tree.
 * clipper: An important library we have to have full control over it. We also have some slicer specific modifications.
-* glu-libtess: This is an extract of the mesa/glu library not oficially available as a package.
+* glu-libtess: This is an extract of the mesa/glu library not officially available as a package.
 * imgui: no packages for debian, author suggests using in the source tree
 * miniz: No packages, author suggests using in the source tree
 * qhull: libqhull-dev does not contain libqhullcpp => link errors. Until it is fixed, we will use the builtin version. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=925540
@@ -29,5 +29,6 @@
 * igl
 * nanosvg
 * agg
+* catch2: Only Arch has packages for catch2, other distros at most catch (v1.x). Being strictly header only, we bundle this in the source tree. Used for the unit-test suites.