diff --git a/Cargo.toml b/Cargo.toml
index f26e8d0aa40..d24acd192e4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -170,4 +170,6 @@ features = ["macros", "num-bigint", "num-complex", "hashbrown", "serde", "multip
 rustdoc-args = ["--cfg", "docsrs"]
 
 [patch.crates-io]
+# Instant misspells emscripten_get_now by including a leading underscore.
+# https://github.com/sebcrozet/instant/pull/47
 instant = { git = 'https://github.com/hoodmane/instant/', branch= 'emscripten-no-leading-underscore' }