From e2862a8d7150da6afd13b6af58c79d4d06a024eb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Ho=C5=99e=C5=88ovsk=C3=BD?=
 <martin.horenovsky@gmail.com>
Date: Fri, 3 May 2019 15:40:21 +0200
Subject: [PATCH] Add documentation for custom precision in float
 stringification

---
 docs/tostring.md | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/docs/tostring.md b/docs/tostring.md
index 77322dc6..549f8aed 100644
--- a/docs/tostring.md
+++ b/docs/tostring.md
@@ -7,6 +7,8 @@
 [Catch::is_range specialisation](#catchis_range-specialisation)<br>
 [Exceptions](#exceptions)<br>
 [Enums](#enums)<br>
+[Floating point precision](#floating-point-precision)<br>
+
 
 Catch needs to be able to convert types you use in assertions and logging expressions into strings (for logging and reporting purposes).
 Most built-in or std types are supported out of the box but there are two ways that you can tell Catch how to convert your own types (or other, third-party types) into strings.
@@ -104,6 +106,22 @@ TEST_CASE() {
 }
 ```
 
+## Floating point precision
+
+Catch provides a built-in `StringMaker` specialization for both `float`
+`double`. By default, it uses what we think is a reasonable precision,
+but you can customize it by modifying the `precision` static variable
+inside the `StringMaker` specialization, like so:
+
+```cpp
+        Catch::StringMaker<float>::precision = 15;
+        const float testFloat1 = 1.12345678901234567899f;
+        const float testFloat2 = 1.12345678991234567899f;
+        REQUIRE(testFloat1 == testFloat2);
+```
+
+This assertion will fail and print out the `testFloat1` and `testFloat2`
+to 15 decimal places.
 
 ---