diff --git a/README.md b/README.md
index 4ebe4b1d..e0d1b8aa 100644
--- a/README.md
+++ b/README.md
@@ -73,20 +73,20 @@ run_tests.sh or manually in t/.
 
 The following variables are available:
 
- * NAME (recommend):       radare2 command being tested (e.g. px).
- * FILE (optional):        File argument for radare2 (defaults to '-')
- * ARGS (optional):        Additional arguments for radare2. If not present 
-                           no additional arguments are used.
- * CMDS (required):        Commands to run, one per line. Just like in 
-                           interactive mode.
- * EXPECT (required):      Expected stdout output.
- * EXPECT_ERR (optional):  Expected stderr output.
- * FILTER (optional):      Filter program (like grep or sed) to filter 
-                           radare2's output before comparing it with EXPECT. 
-                           Useful to fix random output to generate stable tests.
- * BROKEN (optional):      This tests documents a bug which is not yet fixed.
- * EXITCODE (optional):    Check the exit code of radare2 matches. Can be used 
-                           to check handling of invalid arguments.
+ * NAME (string)(recommend):       radare2 command being tested (e.g. px).
+ * FILE (path)(optional):          File argument for radare2 (defaults to '-')
+ * ARGS (string)(optional):        Additional arguments for radare2. If not
+                                   present no additional arguments are used.
+ * CMDS (string)(required):        Commands to run, one per line. Just like in
+                                   interactive mode.
+ * EXPECT (string)(required):      Expected stdout output.
+ * EXPECT_ERR (string)(optional):  Expected stderr output.
+ * FILTER (string)(optional):      Filter program (like grep or sed) to filter
+                                   radare2's output before comparing it with EXPECT.
+                                   Useful to fix random output to generate stable tests.
+ * BROKEN (boolean)(optional):      This tests documents a bug which is not yet fixed.
+ * EXITCODE (number)(optional):    Check the exit code of radare2 matches. Can be used
+                                   to check handling of invalid arguments.
 
 All uppercase variable names are reserved for the test system.