diff --git a/README.md b/README.md
index 7785fd91d..086fcef4a 100644
--- a/README.md
+++ b/README.md
@@ -74,7 +74,8 @@ documentation can be build by running:
     doxygen
 
 in root directory (i.e. where `Doxyfile` is). Resulting HTML documentation
-will be in `build/doc/` directory.
+will be in `build/doc/` directory. You might need to create `build/` directory
+if it doesn't exist yet.
 
 PLUGINS AND EXAMPLES
 ====================
diff --git a/doc/building.dox b/doc/building.dox
index 4a6d6901a..cc17e340f 100644
--- a/doc/building.dox
+++ b/doc/building.dox
@@ -94,7 +94,8 @@ for math formulas. The documentation can be build by running
     doxygen
 
 in root directory (i.e. where `Doxyfile` is). Resulting HTML documentation
-will be in `build/doc/` directory.
+will be in `build/doc/` directory. You might need to create `build/` directory
+if it doesn't exist yet.
 
 @section building-arch Building ArchLinux packages
 In `package/archlinux` directory is currently one PKGBUILD for Git development