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diff --git a/src/tools/clippy/src/docs/flat_map_option.txt b/src/tools/clippy/src/docs/flat_map_option.txt
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+++ b/src/tools/clippy/src/docs/flat_map_option.txt
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+### What it does
+Checks for usages of `Iterator::flat_map()` where `filter_map()` could be
+used instead.
+
+### Why is this bad?
+When applicable, `filter_map()` is more clear since it shows that
+`Option` is used to produce 0 or 1 items.
+
+### Example
+```
+let nums: Vec<i32> = ["1", "2", "whee!"].iter().flat_map(|x| x.parse().ok()).collect();
+```
+Use instead:
+```
+let nums: Vec<i32> = ["1", "2", "whee!"].iter().filter_map(|x| x.parse().ok()).collect();
+```
+\ No newline at end of file