From ea711586b15af11748a1cfb8e435960bd7aeaaea Mon Sep 17 00:00:00 2001
From: Patrick Boettcher <p@yai.se>
Date: Mon, 13 Jul 2020 11:47:44 +0200
Subject: [PATCH] thread-safety section in README added.

---
 README.md | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/README.md b/README.md
index 6e45fec..519ea03 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,21 @@ a validation error occurs and decide what to do (throwing, counting, collecting)
 Another goal was to use Niels Lohmann's JSON-library. This is why the validator
 lives in his namespace.
 
+# Thread-safety
+
+Instance validation is thread-safe and the same validator-object can be used by
+different threads:
+
+The validate method is `const` which indicated the object is not modified when
+being called:
+
+```C++
+	json json_validator::validate(const json &) const;
+```
+
+Validator-object creation however is not thread-safe. A validator has to be
+created in one (main?) thread once.
+
 # Weaknesses
 
 Numerical validation uses nlohmann-json's integer, unsigned and floating point