Update help text
diff --git a/tools/fuzz/fuzz.cpp b/tools/fuzz/fuzz.cpp
index d40f844..f474b30 100644
--- a/tools/fuzz/fuzz.cpp
+++ b/tools/fuzz/fuzz.cpp
@@ -75,9 +75,8 @@
USAGE: %s [options] <input.spv> -o <output.spv> \
--shrink=<input.transformations> -- <interestingness_function> <args...>
-The SPIR-V binary is read from <input.spv>, which must have extension .spv. If
-<input.facts> is also present, facts about the SPIR-V binary are read from this
-file.
+The SPIR-V binary is read from <input.spv>. If <input.facts> is also present,
+facts about the SPIR-V binary are read from this file.
The transformed SPIR-V binary is written to <output.spv>. Human-readable and
binary representations of the transformations that were applied are written to
