Fix documentation for timer thread safety
diff --git a/docs/intro.dox b/docs/intro.dox
index 6f0a229..2de6abe 100644
--- a/docs/intro.dox
+++ b/docs/intro.dox
@@ -249,11 +249,12 @@
- @ref glfwGetTimerFrequency
- @ref glfwGetTimerValue
-The regular timer may be queried from any thread, but this is not synchronized
-by GLFW with calls to @ref glfwSetTime. The following timer related functions
-may be called from any thread:
+The regular timer may be used from any thread, but the reading and writing of
+the timer offset is not synchronized by GLFW. The following timer related
+functions may be called from any thread:
- @ref glfwGetTime
+ - @ref glfwSetTime
Library version information may be queried from any thread. The following
version related functions may be called from any thread:
