diff --git a/tools/binman/README b/tools/binman/README
index decca47..28624fa 100644
--- a/tools/binman/README
+++ b/tools/binman/README
@@ -691,6 +691,16 @@
 typically for filenames.
 
 
+External tools
+--------------
+
+Binman can make use of external command-line tools to handle processing of
+entry contents or to generate entry contents. These tools are executed using
+the 'tools' module's Run() method. The tools generally must exist on the PATH,
+but the --toolpath option can be used to specify additional search paths to
+use. This option can be specified multiple times to add more than one path.
+
+
 Code coverage
 -------------
 
diff --git a/tools/binman/cmdline.py b/tools/binman/cmdline.py
index 3886d52..ee19c5e 100644
--- a/tools/binman/cmdline.py
+++ b/tools/binman/cmdline.py
@@ -52,6 +52,8 @@
                     default=False, help='run tests')
     parser.add_option('-T', '--test-coverage', action='store_true',
                     default=False, help='run tests and check for 100% coverage')
+    parser.add_option('--toolpath', type='string', action='append',
+            help='Add a path to the directories containing tools')
     parser.add_option('-u', '--update-fdt', action='store_true',
         default=False, help='Update the binman node with offset/size info')
     parser.add_option('-v', '--verbosity', default=1,
diff --git a/tools/binman/control.py b/tools/binman/control.py
index 20186ee..df78848 100644
--- a/tools/binman/control.py
+++ b/tools/binman/control.py
@@ -112,6 +112,7 @@
         try:
             tools.SetInputDirs(options.indir)
             tools.PrepareOutputDir(options.outdir, options.preserve)
+            tools.SetToolPaths(options.toolpath)
             state.SetEntryArgs(options.entry_arg)
 
             # Get the device tree ready by compiling it and copying the compiled