Update documentation

README.md

@@ -100,6 +100,8 @@ The first script checks the indentation, line lengths, variable names, white spa
 script checks all documentation strings - its presence and format. Please fix any warnings and errors reported by these
 scripts.
 
+List of directories containing source code, that needs to be checked, are stored in a file `directories.txt`
+
 #### Code complexity measurement
 
 The scripts `measure-cyclomatic-complexity.sh` and `measure-maintainability-index.sh` are used to measure code complexity. These scripts can be run w/o any arguments:
@@ -127,6 +129,8 @@ Please note that due to Python's dynamic nature, static code analyzers are likel
 
 Because of this potential problems, only code detected with more than 90% of confidence is reported.
 
+List of directories containing source code, that needs to be checked, are stored in a file `directories.txt`
+
 #### Common issues detection
 
 The script `detect-common-errors.sh` can be used to detect common errors in the repository. This script can be run w/o any arguments:
@@ -137,6 +141,8 @@ The script `detect-common-errors.sh` can be used to detect common errors in the
 
 Please note that only semantical problems are reported.
 
+List of directories containing source code, that needs to be checked, are stored in a file `directories.txt`
+
 #### Check for scripts written in BASH
 
 The script named `check-bashscripts.sh` can be used to check all BASH scripts (in fact: all files with the `.sh` extension) for various possible issues, incompatibilities, and caveats. This script can be run w/o any arguments: