doc: discuss concurrency in README

spf13 · Apr 15, 2021 · cb41ae0 · cb41ae0
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@@ -856,6 +856,9 @@ There has been several attempts to implement case sensitivity, but unfortunately
 
 You can vote for case sensitivity by filling out this feedback form: https://forms.gle/R6faU74qPRPAzchZ9
 
+### Is it safe to concurrently read and write to a viper?
+
+No, you will need to synchronize access to the viper yourself (for example by using the `sync` package). Concurrent reads and writes can cause a panic.
 
 ## Troubleshooting